Secret Society of Super Villains #1 (1976) 1st app. Star Saphire, 1st app. Manhunter

A grouping of supervillains are called together by invitation to the mysterious Sinister Citadel in San Francisco, an evil clone of the original Manhunter. He lectures the villains on the benefits of joining together as a form of 'enlightened self-interest', and reports failure back to Manhunter., Copperhead drops it into the water when he is shot. Grodd leaves him behind to be caught by the police, Manhunter, they are seemingly set upon by the Justice League of America. After they defeat the heroes, they discover that they were in reality robots. A host steps out and reveals himself, to become members of a new Secret Society. After meeting each other (many for the first time) and wondering the nature of their mutual calling