“We take our jokes seriously,” says Alex Gvojic of the Peddy Cash moped gang. We’re standing in Chicago’s Warbux Mopeds storefront, staring at his appropriately named “Peddy Kruger,” in the style of…

Rapper Nigel “Hollywood” Holt is the architect behind Murder Club, the first black-founded moped gang in the country. He’s also the kind of kid who will kiss your girl in front of you. But…