Main Branch Library on Tuesday, I got sidetracked by an exhibit of "subversive humor magazines" on the top floor. It does a good job putting Charlie Hebdo in context, & I actually learned something.
The collector Nat Schmulowitz obtained these by subscribing to the magazine directly. When it turned out the U.S. Postal Service was seizing them instead, he sued them to get his missing issues.
§ Mad World
Subversive Humor Magazines from the Schmulowitz Collection of Wit & Humor
April 1 - May 31 2015