Less than a month later, Gudrun Ensslin wrote an article in a West Berlin underground paper by the name of Agit883 (Magazine for Agitation and Social Practice), demanding a call to arms and a building of the Red Army. The article ended with the words, "Develop the class struggles. Organize the proletariat. Start the armed resistance!" Baader, Ensslin, Mahler, and Meinhof then went to Jordan, where they trained with Popular Front for the Liberation of Palestine (PFLP) and Palestine Liberation Organization (PLO) guerrillas and looked to the Palestinian cause for inspiration and guidance. But RAF organization and outlook were also partly modeled on the Uruguayan Tupamaros movement, which had developed as an urban resistance movement, effectively inverting Che Guevara's Mao-like concept of a peasant or rural-based guerrilla war and instead situating the struggle in the metropole or cities. Many members of the RAF operated through a single contact or only knew others by their codenames. Actions were carried out by active units called 'commandos', with trained members being supplied by a quartermaster in order to carry out their mission. For more long-term or core cadre members, isolated cell-like organization was absent or took on a more flexible form. In 1969 the Brazilian revolutionary Carlos Marighella published his Minimanual of the Urban Guerrilla. He described the urban guerrilla as: The importance of small arms training, sabotage, expropriation, and a substantial safehouse/support base among the urban population was stressed in Marighella's guide. This publication was an antecedent to Meinhof's The Urban Guerrilla Concept and has subsequently influenced many guerrilla and insurgent groups around the globe. Although some of the Red Army Faction's supporters and operatives could be described as having an anarchist or libertarian communist slant, the group's leading members professed a largely Marxist–Leninist ideology. That said, they shied away from overt collaboration with communist states, arguing along the lines of the Chinese side in the Sino-Soviet split that the Soviet Union and its European satellite states had become traitors to the communist cause by, in effect if not in rhetoric, giving the United States a free pass in their exploitation of Third World populations and support of "useful" Third World dictators. Nevertheless, RAF members did receive intermittent support and sanctuary over the border in East Germany during the 1980s. Anti-imperialism and public support When they returned to West Germany, they began what they called an "anti-imperialistic struggle", with bank robberies to