A novel by Philip K. Dick: Clans of the Alphane Moon. Earth dumped its psychotics on the moon of Alpha III - then forgot about them. After more than 2 decades, the Alphane moon suddenly became important again, and a crash-priority project sent a Terran contact team to open up a society that had had 25 years to bring its madness to full flower. The trouble was, Earth's representatives weren't all that sane themselves…

(character sketches from inside cover of a later edition:)
CHUCK RITTERSDORF wasn't sure if he was a gag writer or a CIA agent
LORD RUNNING CLAM did a brisk trade in gems, gold, and stamps - an odd line of work for a Ganymedean slime mold
HOWARD STRAW would as soon kill you as look at you - sooner, in fact
MARY RITTERSDORF used divorce settlements the way Attila the Hun used fire and sword.