The Shadow Thief is a supervillain that worked for Lex Luthor. He was a low life criminal named MacFarlane who lived in Suicide Slum, in an apartment he considered a "dump." After LexCorp developed the Shadow suit, Luthor gave it to him so that he could use it to commit crimes. The media dubbed him "The Shadow Thief." He wanted a raise for his good work so that he could get out of the apartment he was living in, but first Lex wanted to be certain the suit worked so he tested it out himself and recruited a gang. Luthor gets away in the end, but the shadow gang is captured by Superman.
The Shadow Thief first appeared in The Brave and the Bold, Vol. 1 # 36 (July 1961).
Superman, TV series (1988):