anti war film, Vietnam: In the Year’s of the Pig (1969). This format dominated the style of documentary film for the next years. The existence of digital format also facilitated anyone to produce this film. Social and politics critique, environment, and minority group still became the main menu of documentary film theme for the next years.
The influential film-makers of documentary movie have popped out since 70s ear until now. One of them is Erol Morris who has produced unique documentary movies with uncommon theme and subject, such as Gates of Heaven (1978), The Thin Blue Line (1988), and Mr. Death (2000).
Meanwhile, Barbara Kopple is known through her film about labor demonstration, Harlan County, USA (1976) and American Dream (1990). There is also Michael Moore who likes doing social and politics critique through his films, Roger and Me (1989),