> In a vocation where loss of limb (and even life) was not uncommon, prospective workers — in a field disproportionately comprised of working-class African-Americans and whites of Italian and Irish descent who did not benefit from the upward mobility of the G.I. Bill — were forced to offer kickbacks to syndicate representatives at the daily "shape-up," in which prospective workers were forced to compete against each other to secure work irrespective of union membership. At any time, workers could be virtually blacklisted from subsequent employment for arbitrary purposes in the union's "blue books," their jobs often requisitioned by members of the syndicate who were completing prison sentences.
https://www.pulitzer.org/article/underworld-syndicate-malcol...