All groups can poke fun at particular individuals.
Clinton's eating habits or George W.'s speech patterns are obvious examples. David mentioned O'Rourke. I'm only seen him a couple times and never read him, but the humor recall was making fun of certain types of people. When I think of Lenny Bruce, I think if someone making light of human condition rather than particular people. Anyway, as somebody who had been pegged as Chico Marx, and whose namesake used to write the scripts for the Marx Brothers movies, I should be permitted to pontificate about humor.