Here's what Sonny in the novel says:
"I’d like to have it going again before he [Vito] gets better. We have the go-ahead from the cops to operate. The first thing is the policy banks in Harlem. The black boys up there had their fun, now we have to take it back. They screwed up the works but good, just like they usually do when they run things. A lot of their runners didn’t pay off winners. They drive up in Cadillacs and tell their players they gotta wait for their dough or maybe just pay them half what they win. I don’t want any runner looking rich to his players. I don’t want them dressing too good. I don’t want them driving new cars. I don’t want them welching on paying a winner. And I don’t want any free-lancers staying in business, they give us a bad name."