Question: What is the nickname of the leader of Christy Kinahan's rival gang?

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Alex García (boxer): Alex García (born December 2, 1961) is a Mexican-American and former heavyweight boxer best known to be a contender in the 1990s.  A San Fernando native, and former gang member, he served five years in San Quentin State Prison for stabbing a rival gang member.  Upon his release, he found himself training at the Jet Center, where he took up boxing.  He was mentored under William “Blinky” Rodriguez.

Richie Fitzpatrick: Richard "Richie" Fitzpatrick (1880 – November 1, 1904) was a top gunman in the Monk Eastman gang, as well as a former member of the Five Points Gang, during the late 1890s until his death in 1904.  He is best known however for the method of eliminating an Eastman rival where he would meet with the person in question and, after being searched, would inform them that he would not follow Eastman's orders instead seeking to defect to the rival gang and as he excused himself to use the bathroom he would retrieve a planted gun and return surprising the person shooting the victim down.  This would later inspire the famous scene in "The Godfather" Saga.

Vito Bonventre: Vito Bonventre (January 1, 1875 – July 15, 1930) was a New York City mobster who was a leading member of the Brooklyn gang that would later become the Bonanno Crime Family.  He was arrested but then released in 1921 as the leader of a group known as the "Good Killers."  Bonventre was murdered in 1930 at the start of a conflict between his gang and a rival gang led by Joe Masseria, referred to as the Castellammarese War.

2015–17 Irish gangland feud: A major feud between two criminal gangs in the Republic of Ireland has killed ten people.  The Hutch gang, led by Gerry Hutch, and the Kinahan gang, led by Christy Kinahan, are the main participants.

Gerry Hutch: Gerry Hutch (born 1963) is an Irish criminal.  He was the prime suspect for two of the biggest armed robberies in Irish history.  Known for leading a "disciplined, ascetic lifestyle" since leaving prison in 1985, he was christened "The Monk" by Veronica Guerin, an investigative journalist who applied nicknames to Ireland's crime bosses before being assassinated in 1996.

Shooting of Eddie Hutch Snr: The shooting of Eddie Hutch Snr occurred on 8 February 2016.  Eddie was the brother of Gerry Hutch, the leader of the Hutch gang, which was in a feud with the Kinahan gang, led by Christy Kinahan.  The feud of the two criminal gangs, called the 2015–16 Irish gangland feud, in the Republic of Ireland resulted in the deaths of ten people.

Islander 23: Islander 23 also known as I-23 is a Pacific Islander street gang in West Melbourne, Victoria, Australia.  Islander 23 came to prominence in the national media after a large scale brawl in Melbourne's Central Business District between it and the rival gang Apex in March 2016 after the Moomba parade.  It consists largely of youths from a South Pacific background.

Myles O'Donnell: Myles O'Donnell was an Irish American bootlegger and mobster during the Roaring Twenties in Chicago during Prohibition.  He was most famous for being the founder of the West-side O'Donnell Mob aka the Westside O'Donnells or West-side gang (no relation to the South Side O'Donnells, a rival gang).

Altamira prison brawl: The Altamira prison brawl was a deadly fight that occurred on 4 January 2012 in Altamira, Tamaulipas, Mexico.  Officials from the state of Tamaulipas confirmed that 31 people were killed, with another thirteen injured.  The fight started after a drug gang burst into a section of the prison where they were banned from, attacking their rival gang housed there, triggering the fight.  During the altercation, the inmates used several kinds of white arms to kill their opponents.  The prisoners also used sticks and knives to massacre the members of the rival gang.

Manya Surve: Manohar Arjun Surve (8 August 1944  – 11 January 1982), popularly known as Manya Surve, was one of the dons who made an impact in the Mumbai underworld.  He was adarsh singh's chela Being a Hindu, he was denied just two years, his gang rose to such prominence that Pathans, who ruled the underworld for over two decades, sought his help to eliminate the leader of their arch rival gang, the Konkani speaking Kaskar group.  It was headed by Dawood Ibrahim's elder brother, Sabir.  Manya was known for his dare devilry and strategic planning.  For Manya, it was a clear shot to success.  The top gang of the city had come asking him for help and in doing so he would eliminate the other.  The first educated Hindu gangster, who hailed from an area called Agar Bazaar in the suburbs of Dadar.  Manohar Surve, a young man, fresh Kirti College got implicated in a murder that he did not commit and was sentenced to life in Yerwada Jail.

Supporting paragraphs: 2015–17 Irish gangland feud Gerry Hutch
Answer: The Monk