arrest of 16 anarchist leaders of the demonstration.4 Also, from the communication systems that depended on the security forces, the version began to be disseminated… That the events of May 1 were due to a “Russian-Jewish plot” .4

The workers response



Immediately after the massacre, the anarchist union FORA, which had organized the event, called the general strike during a rally in front of the Casa Rosada.5

At that time, the two trade union confederations, the anarchist and the socialist UGT, had decided to undertake the actions jointly.1

The strike lasted a week and was repressed by the military.5 Despite this, it had a national reach, 1 and for several days the city of Buenos Aires was emptied of both homeless people and transportation services.3

As a result of the rapid response andunion of the two major trade union centers, the government established a State of Siege, which was maintained until the following year, 6 as well as signing numerous decrees to expel foreigners from the country.7

May 4th



There was a massive demonstration for the burial of the dead on May 1; Between 50,000 and 80,000 people gathered in front of the morgue. The delegation requested the delivery of the corpses, a request that was ignored and that caused a new confrontation between the workers and the uniformed police.1



May 7th

This day there was the explosion of a bomb on a tram.1



May 9

After intense negotiations with the government of José Figueroa Alcorta – through the provisional vice president – 8 the general strike was lifted. Some requests of the unions were accepted,