The supposition was that when the late Damon Runyon immortalized such citizens as Angie the Ox, the Lemon Drop Kid and Meyer Marmalade, he had largely consulted his own imagination. But last week, when Senator Estes Kefauver's antimonopoly subcommittee opened hearings in Washington on the fight racket, the characters who took the stand to describe the octopus grip of the underworld on U.S.