Third (bit part) movie for Charles Bronson, who has a few lines as an angry dock worker when "Tim Flynn" shows up at the docks looking for work.
The humorous reference to a 'radioactive' drink being called "Old Bikini" is a play on the atomic testing done on Bikini Atoll in the Marshall Islands after WW2.
Fluorescent and UV technology in police work was developing rapidly after WW2 and would become more sophisticated over the next decades. It would be considered mainstream by the time it was shown in Ocean's Eleven (1960), where it was used by the crooks to aid their hit.
A young Ernest Borgnine appears as mob heavy Castro. Two years later, he would bring the same venomous malice to his role as Sgt. "Fatso" Judson in From Here to Eternity (1953). Both characters had flamboyant taste in clothes - Castro's colorful fat neckties and Judson's "Aloha" shirts.
Coincidentally, Broderick Crawford dropped out of Harvard in his first semester there and went to work on the New York City waterfront as a stevedore (aka longshoreman or dockworker).