The Irish Mob refers to various organized crime groups primarily composed of individuals of Irish descent, particularly active in the United States. These groups emerged in the late 19th and early 20th centuries, often involved in activities such as bootlegging, gambling, and extortion. They were known for their strong ties to local communities and sometimes operated in collaboration with other ethnic gangs. Historically, the Irish Mob was most prominent in cities like Boston, New York, and Chicago. Notable figures associated with the mob include James "Whitey" Bulger and John "Jackie" McGurn. Over time, their influence has waned, but they remain a significant part of American organized crime history.