‘Blackout night’, or ‘La Noche del Apagón’, is one of the many sad pages in recent Argentine history. Not widely known countrywide, this tragic night in July 1976 changed the lives of more than 400 people and their family members in the Ledesma district, province of Jujuy.

Azucar que mata (photo/descartable)
A prolonged power cut on the night of 20th July 1976 (repeated between then and 27th July) enabled the kidnapping of 400 students, factory workers, and activists, who were openly speaking against the dictatorship and fighting for better labour conditions. The case directly involved authorities of the sugar company Ledesma, whose vehicles were used for transporting victims and which received direct economic benefits from the disappearances.
With the trials against the military involved in human rights violations underway, society has recently started to look at the relationship between the last dictatorial government and civilians, especially businessmen, who were a necessary cog in the regime’s wheel. Whilst some of these connections were mainly business-related, the Ledesma case shows the full extent of civilian involvement in the kidnappings, murders, and disappearances at the time.
The Ledesma case remained unpunished for years, despite the claims for justice by the victims’ families. Finally, on 15th November this year, federal judge Fernando Poviña prosecuted businessman Carlos Blaquier, owner and president of Ledesma, and former general manager Alberto Lemos as accomplices for the kidnapping of 29 people during the ‘blackout night’.
Ledesma: A Long History of Labour Conflict
Ledesma has over 100 years of history and is currently one of the leading agricultural companies in Argentina. Starting as a sugar company, it evolved and expanded into cellulose and paper production over several decades. From 1970 onwards, Ledesma grew dramatically, adding new businesses such as the production of fruit, juice, meat, and cereals.
Ledesma’s focus on new investments and technologies turned the sugar company into a massive corporation with agricultural interests in the provinces of Jujuy, Salta, San Luis, Buenos Aires, and Entre Ríos. Despite its original location in the province of Jujuy, it has its headquarters in the city of Buenos Aires and commercial centres in Bahía Blanca, Córdoba, Mar del Plata, Mendoza, and Rosario.
The company produces over 40% of Argentine paper and approximately 20% of its sugar and alcohol, and currently employs over 7,700 people all over the country.
Much of the cost of this expansion was borne by the company’s workforce. The history of labour conflicts within Ledesma goes back to the beginning of the 20th century, when the company was formed and staffed by workers from the north-western provinces of Argentina and Bolivia.
As the north of Argentina has been historically populated by indigenous people, the workforce for the new corporations that were established in the area in the 19th and early 20th centuries, following significant industrial transformations in the country, was mainly indigenous. Ariel Ogando, member of Fundación Wayruro in the province of Jujuy and author of the investigation ‘Sugar and Politics. The emergence of capitalism in north-western Argentina’ (‘Azúcar y Política. El surgimiento del capitalismo en el noroeste argentino‘) defines a special model for the sugar companies that were established in Salta and Jujuy. Ogando points out that companies in these provinces were able to overcome their later development by creating a business model based on the monopoly by one owner of both the land the factory. Such a model permitted the company to exploit its workers and avoid competitors, often with the support of the local government.
As Ledesma was established in 1908, all workers for the new sugar company were settled in a place called Libertador General San Martín, which later took the name of the company. In 1917, José Elías Niklison, inspector of the National Labour Department, denounced the labour conditions in Ledesma: indigenous people and peasants were taken from their original locations without knowing their destination; the working day lasted between 12 and 14 hours, and salaries were paid only if there was extra money left. At the same time, the unsanitary living conditions caused a high number of illnesses and deaths among the workers.
However, the situation did not change, especially as the company’s authorities began to take on an increasingly important role in politics. For instance, Herminio Arrieta, Ledesma’s owner and Blaquier’s father-in-law, served as a national deputy for Jujuy between 1934 and 1938, and later was elected as a senator between 1938 and 1943. The local government became increasingly influenced by the big companies, whose owners were deeply connected with the ruling mechanisms and heavily influenced the province’s judicial system, while the first labour unions appeared as a counter-power to the corporate exploitation.
When Pedro Blaquier was appointed as president of Ledesma in 1970, he brought technological innovations and expanded business lines. Those changes required restructuring the general organisation of processes and personnel, which was reduced from 15,000 to 5,000 workers.
The year 1972 marked the first workers’ demonstration at Ledesma since 1949, when union activists mobilised to demand for an expansion of their work rights, pay rises, and improvements in the working and living conditions. After a series of conflicts, the unionised workers reached some of their goals and established themselves as a strong player to confront Ledesma’s authorities.
An important supporter of these demonstrations was local doctor Luis Arédez, who played a significant role in fighting against Ledesma’s labour and housing policy and demanding resources for the proper medical treatment of workers. He had been a Ledesma employee, however his active confrontation had ended with his dismissal from the company in 1959.
In 1973 Arédez was elected mayor of Libertador General San Martín with the backing of several political parties. In the eight months that he lasted as mayor, he enacted important measures against Ledesma. Among them were partial municipal control over the company’s lands and the collection of taxes on its earnings, as the company had operated tax-free until then.
When the military took power in Argentina in March 1976, the situation of unions and individual activists became even worse than before 1972, and in many cases dangerous. Whilst some workers spoke against the new regime, others either supported it or remained passive members of the unions. With Ledesma’s enormous power being eroded by industrial action and political opposition, extraordinary decisions were required.

A 'madre' marches in Jujuy in memory of the 'blackout night' (photo/Sam Verhaert)
The Disappearances
On 24th March 1976, the day of the coup, Arédez and three Ledesma union leaders -Ramón Bueno, Antonio Fillio and Omar Gainza – were taken from their homes and imprisoned in the Villa Gorritti jail, in the city of San Salvador de Jujuy, which served as a torture centre. After several months, they were sent to La Plata and later released. However, Arédez was kidnapped a few more times, until he disappeared forever in 1977. According to the judicial documents and witnesses, Ledesma vehicles were used to transfer the men.
The second – and biggest – disappearance of Ledesma workers took place between 20th and 27th July 1976, when electricity cuts between 10pm and 6am eased the arrival of military forces into the district and over 400 people were kidnapped. Official documents report that “as the arrests were massive, the provincial police lacked its own vehicles and used Ledesma’s”. The company has also been accused of controlling the district’s electricity generators and causing the blackouts.
In total, 26 transfers were made. Most of the people who were taken away did not belong to opposition movements or parties, and were kidnapped because of their personal connections with the union leaders, “just in case”. Interventions and abductions were carried out in three districts – Libertador, de Calilegua and El Talar.
Most vwere taken to torture centres and police offices all across the country, where they spent between three days and a few months. Thirty-six remain disappeared and are considered dead.
Survivors of the ‘Blackout Night’ sued Ledesma for the use of the company vehicles and for providing working spaces for the initial detentions. Blaquier and his former manager Lemos have been personally accused for 29 cases of kidnappings.
In the short term, the massive crackdown on its workers allowed Ledesma to reassert its authority over unions and local government institutions. In the long run, it caused a wave of dismissals and a dramatic rise in unemployment in the whole region.
Olga Arédez and the Long Road to Justice
Olga del Valle Márquez de Arédez was Luis Arédez’s wife and his most loyal ally. She witnessed all of her husband’s kidnappings and spoke against Ledesma in court in numerous occasions. Olga Arédez organised the resistance movement in Jujuy and together with the Mothers of Plaza de Mayo, she was one of the key fighters for truth and justice. She was put forward for the Nobel Peace Prize 2005, among 1,000 other women.
In 1983 she started the first demonstrations on the main square of Libertador General San Martín, a few metres away from the general access to Ledesma grounds. As she was alone at the beginning, her demonstrations were silent but frequent: every Thursday she made circles around the square carrying a photo of her husband.
In the ’90s two Argentine directors, Pablo Milstein and Norberto Ludin, researched and filmed ‘Sol de noche’ (‘Night-time Sun’), a documentary, which took several years to film, finally being released in 2003. ‘Sol de noche’ talks about the Arédez family and the ‘Blackout Night’, featuring interviews with the witnesses and company representatives. The documentary was used as material in the judicial investigation against Ledesma and enabled many family members to join Olga Arédez in her fight.
On 29th July 2004, Arédez, together with human rights organisations like H.I.J.O.S., Abuelas de Plaza de Mayo, and various local unions, organised a massive demonstration in Libertador General San Martín. The demonstration gathered over 9,000 participants who walked 10km, commemorating the victims of the ‘Blackout Night’ in 1976.
Along with action taken in relation to the disappearance of her husband, Olga Arédez has sued Ledesma for its environmental policies, accusing the company of heavily polluting air and water in the area.
Ledesma Goes to Court
The judicial proceedings against Ledesma had been stalled for years under the watch of judge Carlos Olivera Pastor, who was severely questioned by human rights organisations and who eventually resigned this year. Olivera Pastor was replaced by judge Fernando Poviña and the case finally started to move forward.
The General Secretary of the European Centre for Constitutional and Human Rights (ECCHR), Wolfgang Kaleck, noted that “after years of impunity, not only the crimes of the military, but also the complicity of Ledesma and other companies in state crimes must be investigated. The truth of what happened in the ‘Noche del Apagón’ must come to light.” The ECCHR presented an amicus curiae in several cases concerning Ledesma and their corporate complicity in human rights violations.
Ledesma was raided twice in April 2012, and on 18th May Blaquier was summoned to appear before court to declare in the case of human rights’ violations committed by his company during the dictatorship period. He did not show up, as his lawyers had announced, as he was “suffering medical problems and needed special treatment abroad”. Following that announcement, judge Poviña forbade Blaquier to leave the country and also arrested four policemen who had been involved in the ‘Blackout Night’.
After another failed attempt in July, Blaquier finally declared before judge Poviña via teleconference from Jujuy on 8th August. The businessman denied all involvement in the ‘Blackout Night’, and stated that his company did not cut the power supply or provide vehicles to the kidnappers in July 1976.
On 15th November, Poviña prosecuted Blaquier and Lemos as accomplices for the kidnapping of 29 people, including Arédez. The judge presented his investigation in two documents of 200 pages each, where he emphasised the complicity between businessmen and the military in state-sponsored terrorism, and suggested a new category for corporate responsibility in crimes against humanity. In his report, Poviña goes as far back as 1955 to expose the intricate links that were developed between economic and military interests.
To explain the relevance of civilian involvement in these crimes, Poviña referred to the Nuremberg Tribunal, which judged Nazi crimes committed during World War II: “The Nuremberg jurisprudence did not distinguish between the executor and accomplice, but rather considered any form of participation in the crime as enough to consider the party responsible.” With these words, the judge interpreted corporate complicity as a form of criminal responsibility, a definition the Ledesma case illustrates vividly.
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