The Working Class on Film -- Film Description:
"This film, through excerpts taken from early British documentaries and National Film Board films, illustrates the origins of the documentary as visualized by John Grierson, filmmaker and social agitator, and it traces the development of the documentary over the past fifty years."
-- National Film Board of Canada

Source:
National Film Board of Canada. "NFB -- The Working Class on Film" National Film Board of Canada. http://onf-nfb.gc.ca/en/our-collection/?idfilm=11480.