Synthesis anarchism, synthesist anarchism, synthesism or synthesis federations is a form of anarchist organization that seeks diversity upon its participants and tries to join anarchists of different tendencies under the principles of anarchism without adjectives. In the 1920s, this form found as its main proponents the anarcho-communists Voline and Sébastien Faure, bringing together anarchists of three main tendencies, namely individualist anarchism, anarchist communism and anarcho-syndicalism. It is the main principle behind the anarchist federations grouped around the contemporary global International of Anarchist Federations.