Last July 2, 2013, Idalberto Ferrera Acosta, age 95, died in Havana. Idalberto devoted his entire life to the Revolution. In 1933-1934 he joined the Bolshevik-Leninist Party, the Cuban Trotskyist organization. He was a militant in the union and political movements in Guantanamo and Santiago de Cuba. The actions of Cuban Trotskyists were very important in the 1930s because they had significant influence in the unions in several regions in Cuba, particularly in the East (Guantanamo, site of the U.S. Navy base, and Santiago de Cuba) and in Havana [1]. Idalberto Ferrera made active contributions.