On this day, 20 March 1975, Operation Red Snake of the Paraná began in Argentina, when the government of Isabel Perón sent hundreds of police and troops into the town of Villa Constitución to break the organisation of militant industrial workers. They arrested 307 workers, but the working class fought back, going on strike and occupying their plants until the detainees were released. The occupations lasted until March 26 when they were forcibly broken up by police. Over the next two months the government continued to arrest, blacklist and kill workers in the name of fighting “subversion”. This sort of repression is well-known under the military dictatorship but much less so under Peron, who had the support of most unions. https://www.facebook.com/workingclasshistory/photos/a.296224173896073/1676847799167030/?type=3