"Murder, Inc." was a term used to describe a group of contract killers associated with the National Crime Syndicate in the United States during the 1930s and 1940s. This organization was primarily composed of members from the Italian-American and Jewish-American communities and operated mainly in New York City. They were responsible for numerous assassinations and were known for their ruthless efficiency. The group was believed to be involved in organized crime activities, including extortion and racketeering. Law enforcement eventually cracked down on their operations, leading to several arrests and trials. The notoriety of "Murder, Inc." has made it a significant part of American crime history.