Here are some good films on YouTube that are otherwise difficult to find.
1.
Powell and Pressburger, 49th Parallel
A WW2 propaganda movie that had one task: to convince America to join the Allies by highlighting the vulnerability of the Canadian border. But instead of just doing this, it presented a study in contrast between the pure nihilism of Nazi race creeds and the pluralism of imperial democracy. And a portrait of the complex relationship between national and ethnic identity and empire. And a defence of art and humanism in the face of cultural philistinism. Plus a few other things, too.