Based on the various "Injustice Society (of the World)" line-ups from their first Golden Age appearance (All Star Comics #37 in 1947) until Crisis on Infinite Earths in 1985, who were your favorite members?
Possibilities are:Brain Wave (Henry King, Sr.)
Fiddler (Isaac Bowin)
Gambler (Steven Sharpe III)
Harlequin (Molly Mayne)
Icicle (Joar Mahkent)
Per Degaton
Shade (Richard Swift)
Solomon Grundy
Sportsmaster (Lawrence Crock)
Thinker (Clifford DeVoe)
Tigress (Paula Brooks)
Vandal Savage
Wizard (William Zard)
Don't forget, these are the ones said to be members during various Golden Age / Silver Age / Bronze Age appearances; we're not talking about members specifically of "Injustice Unlimited" or any other, later versions of the Injustice Society.
Also note: while Harlequin (Molly Mayne) may not be a true "villain", she was invited to be a member during their second appearance (in All Star Comics #41 in 1948).