Taxi Driver

Travis Bickle, a 26-year-old honorably discharged U.S. Marine, is a lonely, depressed young man living on his own in New York City. He becomes a taxi driver to cope with his chronic insomnia, driving passengers every night around the boroughs of New York City. He also spends time in seedy porn theaters and keeps a diary. Travis becomes infatuated with Betsy, a campaign volunteer for Senator and presidential candidate Charles Palantine. After watching her interact with fellow worker Tom through her window, Travis enters to volunteer as a pretext to talk to her, and takes her out for coffee. On a later date, he takes her to see a Swedish sex education film, which offends her, and she goes home alone. His attempts at reconciliation by sending flowers are rebuffed, so he berates her at the campaign office, before being kicked out by Tom.
Travis confides in fellow taxi driver Wizard about his thoughts, which are beginning to turn violent, but Wizard assures him that he will be fine, leaving Travis to his own destructive path. Travis is disgusted by the sleaze, dysfunction, and prostitution that he witnesses throughout the city, and attempts to find an outlet for his frustrations by beginning a program of intense physical training. A fellow taxi driver refers Travis to illegal gun dealer Easy Andy, from whom he buys a number of handguns. At home, Travis practices drawing his weapons and constructs a sleeve gun to hide and then quickly deploy a gun from his sleeve. One night, Travis enters a convenience store moments before an attempted armed robbery and he shoots and kills the robber. The shop owner takes responsibility for the shooting, taking Travis' handgun. On another night, teenage prostitute Iris enters Travis's cab, attempting to escape her pimp Matthew "Sport" Higgins. Sport drags Iris from the cab and throws Travis a crumpled twenty-dollar bill, which continually reminds him of her and the corruption that surrounds him. Some time later, Travis hires Iris, but instead of having sex with her, attempts to dissuade her from continuing in prostitution. He fails to completely turn her from her course, but she does agree to meet with him for breakfast the next day. Travis leaves a letter to Iris at his apartment saying he will soon be dead, with money for her to return home.
After shaving his head into a mohawk, Travis attends a public rally, where he plans to assassinate Senator Palantine, but Secret Service agents notice him with his hand in his coat and chase him. He flees and later goes to the East Village to invade Sport's brothel. A violent gunfight ensues and Travis kills Sport, a bouncer, and a mafioso. Travis is severely injured with multiple gunshot wounds. Iris witnesses the fight and is hysterical with fear, pleading with Travis to stop the killing. After the gunfight, Travis attempts suicide, but has run out of ammunition and resigns himself to lying on a sofa until police arrive. When they do, he places his index finger against his temple gesturing the act of shooting himself.
Travis, after having recovered from his wounds and returning to work, receives a letter from Iris' father thanking him for saving her life and revealing that she has returned home to Pittsburgh, where she is going to school. Later, he reconciles with Betsy after dropping her off at home in his cab. When she tries to pay her fare, Travis simply smiles at her and drives away. In the final shot, Travis looks in the rearview mirror and suddenly becomes agitated.

Question: What is higgins's nickname?
Answer: Sport