I assume you meant in this guy's career. Jimmy a lightweight to welterweight fighter, beat at least four top jewish boxers clean: Sid Terris (knocked cold in one round, the so-called "Ghost of the Ghetto"), Ruby Goldstein (done in two, the "Jewel of the Ghetto"), Al Singer (three rounds, the "Battling Bronco of the Bronx"), and the legendary Benny Leonard (six rounds). That's the core procession that built his infamy, but tangled with others like Jackie Fields (another kike he KO'd in six back in '31) and even Kid Kaplan earlier in his career. It's worth noting that around that same time in the light heavyweight division, James Braddock who the subject of the film Cinderella Man, beat the jew boxer Max Baer who famously wore a star of remphan on his shorts. After Braddock beat him, his career took a nose dive. Good stuff.