For the premiere super-team of the Justice Society of America, their evil counterpart came with All-Star Comics #37 (October-November, 1947, by Robert Kanigher and Irwin Hasen) with "The Injustice Society of the World"...a team made up of foes of the JSA!
This team was made of these members the first time around...
the two Flashes in Flash #137 (June, 1963), and returned again and again, not only to face the JSA, but also the Flashes (Jay Garrick and Barry Allen in Flash #215 and #235 in the 1970s and Wally West in Flash #1, #2, #13 to #16 and more in the 1980s and Flash #48 to #50 in the 1990s), Superman (Action Comics #515 #516, #542, #543 and #556 in the 1980s), Rip Hunter with the Forgotten Heroes (Action Comics #552 and #553 in February and March, 1984) and Time Masters (Time Masters 8 issue mini-series in 1990), the Martian Manhunter and his Justice League Task Force (including Gypsy in Justice League Task Force #17-#21, #25, #27, #28 and #37 and the Ray in Ray #14-#21 and #28), Hawkman (Hawkman #29 and #30 in February and March, 1996), Arsenal (in the four issue Arsenal mini-series of 1998) and the Titans (fronting their gathering of foes, Tartarus in Titans #5 to #12 in 1999), Resurrection Man (Resurrection Man #24 to #27 of 1999), and even his own daughter, Scandal Savage and her group, the Secret Six (Villains United #5 and #6 of November and December 2005, and Secret Six #3 to #6 of September to December, 2006), as well as being the driving force in getting the Justice Legion A to come back to the current time in DC One Million...
...not bad for an old man around almost as long as the dinosaurs, eh?
The Gambler picked up skills like mastering disguise, throwing knives and guns (his gimmicked to fire ammonia or blackout gas), and ran across Green Lantern (Alan Scott) next to his own wanted poster in Gotham City! Gotham seemed to have a problem keeping criminals in jail, or maybe it was just luck...the Gambler returned again and again in the Golden Age, with Green Lantern #20 (June-July, 1946), Green Lantern #27 (August-September, 1947), joining the ISW, and coming back to face Green Lantern twice more, in Green Lantern #30 (February-March, 1948) and Green Lantern #35 (November-December, 1948), though as luck would have it, he didn't make it onto any of those covers.
Flash #123 of September, 1961), with Clifford now using the Thinking Cap of Dr. Hartford Jackson (from Flash Comics #65 of June, 1945), which gave the mob organizer amplified brain power, including projecting mental force. Soon after being defeated by the two Flashes, the Thinker moved up to full super-villain mode, getting a costume and improving the helmet, facing off against the two Atoms in Atom #29 (February-March, 1967), then working with old Flash foe, the Rag Doll, in Flash #229 (September-October, 1974), rejoining the ISW in All-Star Comics #66 (May-June, 1977), and facing off against the Huntress and Power Girl in Wonder Woman #274 to #276 (December to February, 1980/1981)...all the while pretty much avoiding being on a comic cover!
Ronnie Raymond's high school nemesis, Cliff Carmichael, getting the Thinking Cap DeVoe left behind from Amanda Waller, and being the new Thinker for a time (starting in Firestorm #99, July, 1990)...and another version of the Thinker in an Artificial Intelligence that was part of a new Injustice Society of the World (starting in JSA #16, November, 2000) (that eventually went to work for Amanda Waller in Checkmate, no less).
Check back soon for the other 3 original members, Brain Wave, Per Degaton and The Wizard!