Grierson is a 1973 documentary directed by Roger Blais for the National Film Board of Canada (NFB).
He believed that filmmakers have a social responsibility, and that film should help society realize democratic ideals.
His faith in the value of capturing everyday life influenced generations of filmmakers all over the world.
It was released in English and French, with commentary by Donald Brittain; the English version was narrated by Michael Kane, the French version by Monique Miller.
This article related to a Canadian documentary film of the 1970s is a stub.