Vietnam
College students in the 60's weren't "playing politics". They were protesting an illegal, immoral, and unwinnable war. Hell, half the men on campus were there so they wouldn't have to go to Vietnam.
I imagine today's generation of professors would feel a little differently if TV news showed maimed soldiers in Iraq every night, their classes were full of young men who didn't want to be drafted, and their campuses were occupied by armed National Guardsmen who shot unarmed students.
[Prediction: This will be voted up by those who actually experienced the absurdity of the 60's and voted down by those who can't imagine it could have been that bad. Since the average age in this community is probably below 40, this post will end up negative.]