According to several different sources, Al Capone and Lucky Luciano were co-members of a gang known as the Five Pointers.
That perception may have been based in the fact that Johnny Torrio, Capone's mentor, had been a Five Pointer--the long-running Lower East Side gang. But Torrio later moved to the Brooklyn Navy Yard district, where he became a ward heeler and racketeer, and where the adolescent Capone met and worshipped him.
BTW: Kobler explains the origin of the word, "racket." He writes that, periodically, ward heelers and gang leaders would enrich themselves by throwing a dinner in their own honor, and "inviting" (read: requiring) local politicians, merchants and their own cohorts to make substantial "contributions" to the dinner, to the "commemorative journal," etc. These were loud, raucous, sometimes violent affairs, with everyone getting drunk, throwing rolls at each other, etc. They made a loud racket, in other words. (The all-time great movie "Little Caesar" accurately shows a "racket" dinner when Caesar takes over the Club Palermo gang from Sam Vettore.) Gradually, "racket" came to describe any illicit or semi-illicit money-making scheme or business.