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.
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.
Anthony James "White Tony" Johnson (22 July 1968 – 22 February 1991) was an English organised crime figure, the one-time head of the Cheetham Hill Gang in Manchester.
 He was murdered in 1991 when he was gunned down in the car park of the Penny Black pub, Cheetham Hill.
 Fellow organised crime figure Desmond Noonan was tried for the murder, but acquitted.
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.
Outlaw: Gangster VIP (「無頼」より　大幹部 , "Burai yori daikanbu" ) is a 1968 Japanese crime film directed by Toshio Masuda.
 The film stars Tetsuya Watari who plays Goro, a gangster who was sent to prison for three years for stabbing a hitman (Machida Kyosuke) who belonged to the rival gang called the Aokis.
 On his release from prison, Goro finds out his gang is in decline and learns that the hitman he stabbed is still alive.
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.
The Cheetham Hill Gang is well known for loyalty among its members, who stick together as one unit.
 Hailing from a relatively small part of the town is one reason for the gang's success against rival gangs (such as Moss Side) who are often plagued by internal disputes.
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).
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.
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.

Question: What was the rival gang of Anthony "White Tony" Johnson's gang?
Answer: Moss Side