Emiel van Moerkerken came to Breton, he did not want to sign the manifesto because he was not a Trotskyist. For Breton being a communist was not enough. Breton denied Van Moerkerken's pictures for a publication afterwards. This caused a split in surrealism. Others fought for complete liberty from political ideologies, like Wolfgang Paalen, who, after Trotsky's assassination in Mexico, prepared a schism between art and politics through his counter-surrealist art-magazine DYN and so prepared the ground for the abstract expressionists. Dalí supported capitalism and the fascist dictatorship of Francisco Franco but cannot be said to represent a trend in Surrealism in this respect; in fact, he was considered, by Breton and his associates, to have betrayed and left Surrealism. Benjamin Péret, Mary Low, Juan Breá, and Spanish-native Eugenio Fernández Granell joined the POUM during the Spanish Civil War. Breton's followers, along with the Communist Party, were working for the "liberation of man". However, Breton's group refused to prioritize the proletarian struggle over radical creation such that their struggles with the Party made the late 1920s a turbulent time for both. Many individuals closely associated with Breton, notably Aragon, left his group to work more closely with the Communists. Surrealists have often sought to link their efforts with political ideals and activities. In the Declaration of January 27, 1925, for example, members of the Paris-based Bureau of Surrealist Research (including Breton, Aragon and Artaud, as well as some two dozen others) declared their affinity for revolutionary politics. While this was initially a somewhat vague formulation, by the 1930s many Surrealists had strongly identified themselves with communism. The foremost document of this tendency within Surrealism is the Manifesto for a Free Revolutionary Art, published under the names of Breton and Diego Rivera, but actually co-authored by Breton and Leon Trotsky. However, in 1933 the Surrealists’ assertion that a "proletarian literature" within a capitalist society was impossible led to their break with the Association des Ecrivains et Artistes Révolutionnaires, and the expulsion of Breton, Éluard and Crevel from the Communist Party. In 1925, the Paris Surrealist group and the extreme left of the French Communist Party came together to support Abd-el-Krim, leader of the Rif uprising against French colonialism in Morocco. In an open letter to writer and French ambassador to Japan, Paul Claudel, the Paris group announced: The anticolonial revolutionary and proletarian politics of "Murderous Humanitarianism" (1932) which was drafted mainly