Left Wing Films listed at the DSA site
This collection is really about left wing movies plus a lot of movies of interest to socialists which aren't explicitly left-wing. It doesn't pretend to be anything like exhaustive.
From Amistad to Z. Films about Class, Power and Social Justice (pdf)
Listed at classaction.net. HTML version here
Movie Review Query Engine
Michael Moore - the End of Capitalism
Sacco and Vanzetti documentary
Sacco and Vanzetti reviewed