Labor Day in Spain, known there as Día del Trabajador or Primero de Mayo, was first celebrated on May 1, 1889. The way in which Spaniards celebrate Primero de Mayo has varied greatly since then, due primarily to the Francoist State, which lasted from 1936 to 1975. After 4 decades of being prohibited, in 1978 the celebration was finally re-legalized and re-instated as a national holiday, and since then every Primero de Mayo has been marked by protests and manifestations all over the country, in which social advances are celebrated and workers’ rights are revindicated. Development Origin The date for Spain's Primero de Mayo has the same origin as International Workers' Day: the Haymarket Revolt in 1886 Chicago. Workers all over the United States had been asking for an 8-hour work day since April, and threatened a strike to begin on May 1 if employers did not compromise. In Chicago, the strike lasted an extra 3 days, and on May 4 turned into a violent clash between protestors and the police. A bomb that killed several policemen led to the imprisonment of over 30 and assassination of 5 accused civilians, which led to a serious discussion regarding workers’ rights by governments all over the world. Finally, in 1889, May 1 was declared International Workers' Day by the Socialist Workers Congress of the Second International. at a conference held in Paris That same year Spain celebrated its very first Día del Trabajador, which was adopted through two different routes by the Spanish labor movement: socialists throwing a ‘labor party’ in an attempt to support that sector of the population while avoiding violence, and anarchists calling a revolutionary strike. Introduction of Primero de Mayo For the first Día del Trabajador, the socialists were worried that there would not be enough participation on the signaled May 1, and were therefore planning on organizing the manifestation on Sunday, May 4 instead. Their concern turned out to be unnecessary, however, since the working class was already organizing itself for manifestations on May 1, as all had heard about the decision made at the conference held in Paris earlier in the year. The anarchists too were planning on having their protests on May 1, as that had been decided as International Workers' Day. For Spain's first Primero de Mayo, two different manifestations occurred in Madrid, the socialist and anarchist, taking different routes. The socialists organized thousands