Autonomism or Autonomist Marxism is a set of anti-authoritarian left-wing political and social movements and theories. As a theoretical system, it first emerged in Italy in the 1960s from workerist (operaismo) communism. Later, post-Marxist and anarchist tendencies became significant after influence from the Situationists, the failure of Italian far-left movements in the 1970s, and the emergence of a number of important theorists including Antonio Negri, who had contributed to the 1969 founding of Potere Operaio, as well as Mario Tronti, Paolo Virno and Franco "Bifo" Berardi.