John "Handsome Johnny" Roselli (sometimes spelled Rosselli; born Filippo Sacco; July 4, 1905 – August 7, 1976) was an Italian-born mobster for the Chicago Outfit who helped that organization exert influence over Hollywood and the Las Vegas Strip. Roselli was recruited by the Central Intelligence Agency (CIA) in a plot to assassinate Cuban leader Fidel Castro.

Helmuth Schmidt (July 4, 1876 – April 23, 1918), also known as The American Bluebeard, was a German-born American bigamist, murderer and suspected serial killer. Soon following his arrest in connection with the murder of maid Augusta Steinbach, Schmidt committed suicide in his jail cell.

Gerald Matticks (4 July 1940 – 21 November 2025) was a Canadian gangster and the long-time leader of the West End Gang of Montreal.

On August 9, 1982, a mass shooting and vehicle-ramming attack took place in Grand Prairie, Texas, United States. The perpetrator, 49-year-old John Parish, carried out a shooting around two warehouses he worked for before fleeing the scene in a stolen semi-trailer truck.

Meyer Lansky (born Maier Suchowljansky; July 4, 1902 – January 15, 1983) was a Russian-born American organized crime figure associated with gambling operations and illicit finance in the United States, Cuba, and the Caribbean during the mid-20th century. He was closely linked to Charles "Lucky" Luciano and is frequently described by historians and law-enforcement sources as a key figure in the formation of interethnic criminal cooperation in the United States, including the network later referred to as the National Crime Syndicate.

Jeppe Prætorius (4 July 1745 – 6 April 1823) was a Danish merchant, slave trader and shipowner.

Mohammed Amin al-Husseini (Arabic: محمد أمين الحسيني; c. 1897 – 4 July 1974) was a Palestinian Arab nationalist and Muslim leader in Mandatory Palestine.