Angelo Meli (February 10, 1897 - December 1969) was a Detroit, Michigan mobster who became a consigliere and then leading Chairman of the Detroit Partnership criminal organization of La Cosa Nostra.
The Dallas crime family was an American Mafia crime family based in Dallas, Texas.
The St. Louis crime family, also known as the Giordano crime family, is an American Mafia crime family based in St. Louis, Missouri, United States.
The New Orleans crime family is an American Mafia Crime family based in the city of New Orleans.
 The Crime Family has a history of criminal activity dating back to the late nineteenth century.
 The family reached its height of influence under Carlos Marcello, one of America's most powerful Mafia dons during the mid-twentieth century and at its height had over a hundred members.
 However, a series of setbacks during the 1980s reduced its clout, and law enforcement dismantled most of what remained shortly after Marcello's death in 1993.
 In spite of this, it is believed that some elements of the organization remain active in the Big Easy today.
William "Wild Guy" Grasso was an Italian-American gangster from East Haven, Connecticut who served as underboss to Raymond Patriarca, Jr. (a.k.a. "Junior") in the Patriarca crime family, also known as the New England crime family, the Providence crime family or the Boston crime family.
 The Patriarca family is a Mafia crime family based in New England.
 Succeeding his father Raymond L.S. Patriarca as boss after his father's death in 1984, Junior was considered a weak leader.
 He managed to keep the peace in his crime family due to the support of the Gambino crime family of New York.
 When Junior's original underboss Ilario "Larry Baione" Maria Antonio Zannino was sentenced to thirty years in prison in 1987, it further weakened Junior's position.
 With Zannino in jail, Grasso became underboss.
The Detroit Partnership, also known as the Detroit crime family, Detroit Combination, Detroit Mafia, or Zerilli crime family (pronounced ] ) is an American Mafia crime family based in Detroit, Michigan.
The Pittsburgh crime family, also known as the LaRocca crime family, is an American Mafia crime family based in Pittsburgh, United States.
The Patriarca crime family (pronounced ] ) is also known as the New England crime family, the Providence crime family, the Boston crime family, the Boston Mafia, the Providence Mafia, the New England Mafia, or The Office and is an Italian-American Mafia crime family based in New England.
 The crime family has two distinct factions, one active in Providence, Rhode Island and the other in Boston, Massachusetts.
The Buffalo crime family also known as the Magaddino crime family and The Arm, was an Italian American Mafia crime family based in Buffalo, New York, United States.
 The family operated throughout Western New York, Ontario, Canada and Erie, Pennsylvania.
The Milwaukee crime family or Balistrieri crime family is an American Mafia crime family based in Milwaukee, Wisconsin.
 The crime family was considered a branch of the Chicago Outfit.
 The family's most influential boss was Frank "Mr. Big" Balistrieri, who was greatly involved in the Las Vegas skimming casinos. Today, the crime family is nearly extinct, since Balistrieri died in 1993, with the "Chicago Outfit" gaining control over some of the illegal rackets in the area.

Question: Angelo Meli was the leading chairman of an American Mafia crime family based where?
Answer: Detroit, Michigan