Part one of a half-assed video history from the students' point of view of the takeover of Columbia University by radicals in 1969 (or maybe, as a commenter claims, May, 1968). Sound and picture are lousy, but it gets more and more interesting as it goes on. Ultimately, of course, all you learn is that the left never changes (warning: contains moral preening, commie-sympspeak, radical vandalism, drumming).
I'll post part two later. But if that's not to your taste, how about Reg Kehoe and His Marimba Queens (early 1940s):
(from the Prelinger Archives of the Internet Archives, where I also get most of the radio shows posted here)
Update: Not working for me, but I think it's the archive's problem.
Update II: Well, hell. Here's the linkie to Reg Kehoe; and here's the linkatage to the student revolutionaries.
Update III: Part two (this one has the pic Wart Churchill used for the cover of Pacifism as Pathology).
Update IV: Oh no! Agitprop theater!
Update V: Oh no! Political action on the highest level of human seriousness!