Cuba's Communists Collaborated With Batista First Before Castro's revolution, Cuba's Popular Socialist Party was the official communist organization in the country. During the late 1930s and early 1940s, the PSP formed a political alliance with Fulgencio Batista, the same dictator they would later oppose. This collaboration with an authoritarian regime destroyed the communist party's credibility among militant Cuban workers. When Castro's July 26th Movement gained momentum, workers abandoned the