Albert Tannenbaum (January 17, 1906 – November 1976), nicknamed Allie or Tick-Tock, was a Jewish-American hitman for Murder, Inc., the enforcement arm of the National Crime Syndicate, during the 1930s.
After a stint as a salesman, he began work at the Loch Sheldrake Country Club, which was owned by his father.
When Tannenbaum was 25, he met a guest at the club by the name of Jacob "Gurrah" Shapiro, a close associate of infamous Jewish gangster Lepke Buchalter.
Tannenbaum followed Greenberg first to Montreal and then to Detroit before finally catching up to him in Los Angeles and killing him under the supervision of (and with the assistance of) the Syndicate's West Coast representative, Bugsy Siegel.
However, in 1940, under pressure from Brooklyn authorities, Tannenbaum became a "stool pigeon" himself, testifying in Buchalter's trial about the involvement of Lepke and Charles Workman in the murder of Dutch Schultz, among others.