"The MAD Primer of Bigots, Extremists and Other Loose Ends," from September 1969.

Seen a couple of these panels make the rounds from time to time, so here's the complete set of 10 (something to amuse and/or offend almost everyone).

Chapter 1: The Super Patriot

Chapter 2: The Ku Klux Klansman

Chapter 3: The American Student

Chapter 4: The Right-Wing Extremist