The Dziga Vertov Group was formed in 1968 by politically active filmmakers including Jean-Luc Godard and Jean-Pierre Gorin. Their films are defined primarily for Brechtian forms, Marxist ideology, and a lack of personal authorship. The group, named after 1920s-'30s Soviet filmmaker Dziga Vertov (1896-1954), was dissolved soon after the completion of 1972's Letter to Jane.