Nightcleaners (1975), by the Berwick Street Film Collective, has long been recognized as a landmark of British experimental cinema. Alongside its companion film '36 to '77 (1978), it pioneered a form as radical as the Collective's politics. The Berwick Street Film Collective was formed in 1970 and produced feature documentaries until around 1980. Influenced in part by filmmakers such as Godard and Marker, its films dealt with some...