The Dziga Vertov Group (French: Groupe Dziga Vertov) was formed in 1968 by two politically active filmmakers, Jean-Luc Godard and Jean-Pierre Gorin. Jean-Henri Roger and Armand Marco joined the group in 1969. 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, was dissolved soon after the completion of Letter to Jane: An Investigation About a Still (1972).