Strike is a 1925 Soviet silent film telling the story of a factory strike in Russia before the revolution. Eisenstein's first feature-length film, he also made The Battleship Potemkin and October. There are a few powerful scenes, including one of a young child asking his father for his dinner and a graphic comparison at the end of the film of the defeated factory workers with slaughtered cattle.
1001Flicks has a review.
The video previously embedded from googlevideo is no longer available, but here's a 12-minute excerpt:
part 2, part 3
The film's ending does not seem to be available.