The Card-Carrying Members
Rock band that heads to the Bavarian city of Ingolstadt to participate in the big Walpurgisnacht rock festival in the 1975 novel Leviathan, the third book in Robert Anton Wilson’s insane Illuminatus! trilogy.
On April 26 the stream became a flood, and while Saul and Barney Muldoon tried to reason with Markoff Chaney and he struggled in their grip, Ingolstadters found themselves inundated by Frodo Baggins and His Ring, the Mouse That Roars, the Crew of the Flying Saucer, the Magnificent Ambersons, the House I Live In, the Sound of One Hand, the Territorial Imperative, the Druids of Stonehenge, the Heads of Easter Island, the Lost Continent of Mu, Bugs Bunny and His Fourteen Carrots, the Gospel According to Marx, the Card-Carrying Members, the Sands of Mars, the Erection, the Association, the Amalgamation, the St. Valentine's Day Massacre, the Climax, the Broad Jumpers, the Pubic Heirs, the Freeks, and the Windows.
The phrase refers to membership in an undesirable political organization and was originally used by Joe McCarthy during the Red Scare.