Question: which gang was John Morrissey a leader in?

Documents:
source: John Morrissey
text: John Morrissey John Morrissey (February 12, 1831 – May 1, 1878), also known as Old Smoke, was an Irish American bare-knuckle boxer and a Dead Rabbits gang criminal leader in New York City in the 1850s and later became a Democratic State Senator and U.S. Congressman from New York, backed by Tammany Hall. Morrissey began his bare-knuckle boxing career after a confrontation with a man known only as "Chroel" who was notorious for troubling his fellow townsmen. Although Morrissey was on the bitter end of his first bare knuckle bout, his display of bravery and fortitude earned himself the respect and historical acknowledgment of his peers.

source: Dead Rabbits
text: Dead Rabbits The Dead Rabbits also known as the Black Birds was the media-bestowed name of an Irish American criminal militia gang in New York City, in the 1850s. Historian Tyler Anbinder says, "The name so captured the imagination of New Yorkers that the press continued to use it despite the abundant evidence that no such club or militia existed." Anbinder notes that, "for more than a decade, 'Dead Rabbit' became the standard phrase by which city residents described any scandalously riotous individual or group."

source: John Daly (gambler)
text: John Daly (gambler) John Daly (1838 – April 26, 1906) was an American sportsman, professional gambler and underworld figure in New York during the late 19th century. A protégé of John Morrissey, he was involved in illegal gambling on Broadway and in Midtown Manhattan for over thirty years. He was also among the principal rivals of "Honest" John Kelly up until the turn of the 20th century and was considered one of the most successful and wealthiest gamblers in New York at the time of his death.

source: Yankee Sullivan
text: Yankee Sullivan Yankee Sullivan (born James Ambrose; c. March 10, 1811 – May 31, 1856), also known as Frank Murray and James Sullivan, was a bare-knuckle fighter and boxer. He was a prizefighting champion from 1851 to October 12, 1853. He considered himself to be the inheritor of Tom Hyer's title, and lost any claim to that title after losing a fight to John Morrissey.

source: John Morrissey (rugby player)
text: John Morrissey (rugby player) Peter John Morrissey (18 July 1939 – 24 July 2013) was a New Zealand rugby union player, businessman and philanthropist.

source: John Morrissey (disambiguation)
text: John Morrissey (disambiguation) John Morrissey (1831–1878) was an American boxer and politician.

source: The Bacchae (film)
text: The Bacchae (film) The Bacchae is an independent film adaptation of Euripides' play "The Bacchae", produced by Lorenda Starfelt and John Morrissey, and directed by Brad Mays.

source: Tom Morrissey (baseball)
text: Tom Morrissey (baseball) Tom J. Morrissey (May, 1860 – September 23, 1941) was an American Major League Baseball player from Janesville, Wisconsin, who played third base for the Detroit Wolverines of the National League, and the Milwaukee Brewers of the Union Association. In his 14 game Major League career, he batted 54 times, collected 10 hits for a .185 batting average. In the field, he committed 11 errors for a .711 fielding percentage. His brother John Morrissey also played Major League Baseball.

source: John Morrissey (footballer)
text: John Morrissey (footballer) John Morrissey, Jr. (born 8 March 1965) is an English former professional footballer who played as a winger. Active between 1984 and 1999, Morrissey made nearly 500 appearances in the Football League.

source: Lew Baker
text: Lew Baker Lewis "Lew" Baker (born c. 1825, date of death unknown) was a patrolman in the New York Police Department who was simultaneously employed as a "slugger" for Tammany Hall. He was involved in voter intimidation and election fraud during the 1840s and 1850s. A close friend and associate of Irish mob boss John Morrissey, Baker frequently battled supporters of the nativist Know-Nothing movement for over a decade. He is most remembered however as the assassin of William "Bill the Butcher" Poole. Baker shot and killed Poole in a Broadway saloon during a brawl. Both Baker and Morrissey were placed on trial for murder, but were acquitted.

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Answer: Dead Rabbits