Doonesbury by Garry Trudeau for December 04, 1971
Transcript:
Man: The delegate from N.Y.U. has made a good point. We must use our electoral power to bring an end to government sanctioned violence. We must work hard so taht violent may never be tolerated again! B.D.: Aw, sit down, Buster! I'm sick of you patronizing radicals sounding off on violence! Who do you think you are!? Man: The delegate from Kent State.
In case people don’t know: https://en.wikipedia.org/wiki/Kent_State_shootings