The Workers' Party of Marxist Unification (Partido Obrero de Unificación Marxista, POUM) was a Spanish communist party, independent from Moscow, which, although numerically small, played an important role in the Spanish civil war and revolution of 1936-9. It is often incorrectly described as Trotskyist.
Was there a Spanish revolution? - Enric Mompo
An essay on the nature of the Spanish Civil War and Revolution of 1936 that briefly summarizes the historical background of the military uprising…