Constantino Paul "Big Paul" Castellano (] ; June 26, 1915 – December 16, 1985), also known as "The Howard Hughes of the Mob" and "Big Paulie" (or "PC" to his family), was an American mafia boss who succeeded Carlo Gambino as head of the Gambino crime family in New York, the nation's largest Cosa Nostra family at the time.
 The unsanctioned assassination of Castellano in 1985 by John Gotti sparked years of animosity between the Gambinos and the other New York crime families.
Giuseppe Colombano "Gyp" Rosetti is a character in "Boardwalk Empire", portrayed by Bobby Cannavale.
 Rosetti is a New York City gangster who works for Joe Masseria (Ivo Nandi).
 Hot-headed and easily offended, he is the primary antagonist of season three.
Steven Mazzone (born 1964) is an American mobster believed to be a high ranking member of the Philadelphia crime family.
 Mazzone's rise in power through the Philadelphia underworld began as a protege of former boss turned informant, Ralph Natale.
 After the family was decimated by prosecutions during the Nicodemo Scarfo and John Stanfa eras, Natale was released from prison in 1994 and shortly thereafter became the new boss of the crime family.
 Natale partnered with the "Young Turks" faction that was one of the few remnants left of the Philadelphia crime family, and their leader, Joseph "Skinny Joey" Merlino.
 After Natale assumed the top position as boss, he positioned Merlino as underboss and Ronald Turchi as the consigliere in the new hierarchy.
 This administration is still in question to this day, as many now believe that Merlino was running the family behind the scenes, letting Natale have the boss position to deter law enforcement from himself.
The Godfather is a 1972 American crime film directed by Francis Ford Coppola and produced by Albert S. Ruddy, based on Mario Puzo's best-selling novel of the same name.
 It stars Marlon Brando and Al Pacino as the leaders of a fictional New York crime family.
 The story, spanning 1945 to 1955, chronicles the family under the patriarch Vito Corleone (Brando), focusing on the transformation of Michael Corleone (Pacino) from reluctant family outsider to ruthless mafia boss.
Vincent Louis Gigante ( ; March 29, 1928 – December 19, 2005), also known as "Chin", was a New York Italian-American mobster in the American Mafia who was boss of the Genovese crime family from 1981 to 2005.
 Gigante started out as a professional boxer who fought 25 bouts between 1944 and 1947.
 He then started working as a Mafia enforcer for what was then the Luciano crime family.
 Gigante was one of five brothers: Mario, Pasquale, Ralph and he all became mobsters in the Luciano family, forerunner of the Genovese family.
 Only one brother, Louis, stayed out of the crime family, instead becoming a priest.
 Gigante was the shooter in the failed assassination of longtime Luciano boss Frank Costello in 1957.
 After sharing a prison cell with Costello's rival, Vito Genovese, following Vito's conviction for heroin trafficking, Gigante became a caporegime, overseeing his own crew of Genovese soldiers and associates that operated out of Greenwich Village.
 Gigante was one of Genovese's most loyal supporters, siding with him throughout the struggle for power with Costello.
Giuseppe "Joe the Boss" Masseria (January 17, 1886April 15, 1931) was an early Mafia boss in New York City.
 He was boss of what is now called the Genovese crime family, one of the New York Mafia's Five Families, from 1922 to 1931.
 He waged a bloody war to take over the criminal activities in New York City, gaining considerable power for himself.
 He was killed in 1931.
Ernest Varacalli (born March 23, 1944), or "Junior", is a New York gangster who belongs to the Genovese crime family, one of the five New York crime families.
 Varacalli has used as many as nine different aliases during his criminal career.
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.
This is a list of minor characters in "The Godfather" series. "
The Godfather" is a 1972 American crime drama directed by Francis Ford Coppola and produced by Albert S. Ruddy, based on Mario Puzo's best-selling novel of the same name.
 It stars Marlon Brando and Al Pacino as the leaders of a fictional New York crime family.
 The story, spanning 1945 to 1955, chronicles the family under the patriarch Vito Corleone, focusing on the transformation of Michael Corleone (Pacino) from reluctant family outsider to ruthless Mafia boss.
Alphonse "Little Al" D'Arco (born July 28, 1932), also known as "The Professor", is a New York mobster who became the acting boss of the Lucchese crime family.
 He was the first boss, acting or otherwise, of a New York crime family to become a government witness.

Question: Gyp Rosetti worked for the boss of which New York Crime Family?
Answer: Genovese