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History—America (1920s and 30s)
Jewish mobsters ruled most of the large cities of America as the Roaring Twenties brought wealth and strikes as well as the formation of syndicalist trade unions and unrest.
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- Category: History—America (1920s and 30s)

Meyer Lansky(born Meier Suchowlański;[2] July 4, 1902 – January 15, 1983), known as the "Mob's Accountant", was an American[3] major organized crime figure who, along with his associate Charles "Lucky" Luciano, was instrumental in the development of the National Crime Syndicate in the United States.[4]
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- Parent Category: Historic Impact
- Category: History—America (1920s and 30s)

The Atlantic City Conference held between 13–16 May 1929[1] was a historic summit of leaders of organized crime in the United States. It is considered by most crime historians to be the earliest organized crime summit held in the US. The conference had a major impact on the future direction of the criminal underworld and it held more importance and significance than the Havana Conference of 1946 and the Apalachin meeting of 1957. It also represented the first concrete move toward a National Crime Syndicate.[2]
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- Parent Category: Historic Impact
- Category: History—America (1920s and 30s)

The Commission is the governing body of the American Mafia,[1] formed in 1931. The Commission replaced the "Boss of all Bosses" title with a ruling committee consisting of the New York Five Families bosses and the bosses of the Chicago Outfit and the Buffalo crime family.[1] The last known Commission meeting held with all the bosses was in November 1985.[2]
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- Parent Category: Historic Impact
- Category: History—America (1920s and 30s)

The Five Families are the five major New York City organized crime families of the Italian American Mafia.
The term was first used in 1931, when Salvatore Maranzano formally organized the previously warring gangs into what are now known as the Bonanno, Colombo, Gambino, Genovese, and Lucchese crime families, each with demarcated territory, organizationally structured in a now-familiar hierarchy, and having them reporting up to the same overarching governing entity. Initially Maranzano intended each family's boss to report to him as the capo di tutti capi (boss of all bosses), but this led to his assassination and by September the role was replaced by The Commission, which continues to govern American Mafia activities in the United States and Canada.
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- Parent Category: Historic Impact
- Category: History—America (1920s and 30s)

John Llewellyn Lewis (February 12, 1880 – June 11, 1969) was an American leader of organized labor who served as president of the United Mine Workers of America (UMW) from 1920 to 1960. A major player in the history of coal mining, he was the driving force behind the founding of the Congress of Industrial Organizations (CIO), which established the United Steel Workers of America and helped organize millions of other industrial workers in the 1930s. After resigning as head of the CIO in 1941, he took the Mine Workers out of the CIO in 1942 and in 1944 took the union into the American Federation of Labor (AFL).


