Paid in Full is a 2002 American crime drama film directed by Charles Stone III.
 It takes place in Harlem in the 1980s.
 The title of the film is taken from the 1987 album and 1987 song by Eric B. & Rakim.
 "Paid in Full" is based on three friends Azie "AZ" Faison, Rich Porter and Alpo Martinez and their professional criminal exploits.
 The characters Ace (Wood Harris), Mitch (Mekhi Phifer) and Rico (Cam'ron), respectively, are based on these three drug dealers.
The discography of Yasiin Bey / Mos Def, an American rapper, consists of four solo albums, two compilation albums, and several singles.
 Mos Def began his hip hop career in 1994 in the underground rap group UTD (Urban Thermo Dynamics) alongside his sibling group members DCQ and Ces, after which he pursued a solo career.
 In 1998, he made his mainstream debut on Rawkus Records in the trio Black Star with rapper Talib Kweli and producer Hi-Tek.
 "Definition", the single from Black Star's self-titled debut album, reached #60 on the "Billboard" Hot 100 and #3 on the Hot Rap Singles chart.
Richard "Rich" Porter (July 26, 1965January 4, 1990) was an American drug dealer who rose to prominence in Harlem during the War on Drugs in the mid-1980s; police described him as being a "high-level crack dealer" who "sold about $50,000 worth of crack a week".
 The 2002 film "Paid in Full" was based on Rich and his partners Azie Faison and Alpo Martinez.
Megadef is the second album by Los Angeles underground rap group Styles of Beyond, which was released on Spytech Records on September 9, 2003 after their 1998 installment "2000 Fold".
 The album's title is both an instance of wordplay, namely a portmanteau of the name of the band Megadeth with those of bands/labels/artists such as Def Leppard, Mos Def, and Def Jam Records, and a reference to the Hebrew term "megadef" (מגדף), the latter term referring to the violation of Jewish law committed by cursing the sacred name of God.
 "Megadef" was released only in an "explicit version" and was available as a download via iTunes and Amazon.
 The album was produced by the group members DJ Cheapshot and Vin Skully.
Andrew Daulton Lee (born 1952) is an American drug dealer and former agent who was convicted of espionage for his involvement in the spying activities of his childhood friend, Christopher Boyce.
Styles of Beyond is an underground hip hop group from the San Fernando Valley of Los Angeles, California.
 The group consists of MCs Ryan Patrick Maginn (Ryu) and Takbir Bashir (Tak), Colton Raisin Fisher (DJ Cheapshot), and producer Jason Rabinowitz (Vin Skully).
 They have released two LPs, one mixtape and were heavily featured on Mike Shinoda's Fort Minor project in 2005.
 At one point they were also signed to Shinoda's Machine Shop Recordings label, although they left the label in late 2008.
 They are also heavily associated with the underground rap group Demigodz which features similar underground artists such as Apathy, Celph Titled, and 7L & Esoteric.
Azie Faison (pronounced "A.Z.") is an American former drug dealer, selling cocaine in Harlem, New York, as well as a rapper and founder of the underground hip-hop group MobStyle.
 His legacy has been referenced by several rap artists, and his life was the basis for the film "Paid in Full" produced by Roc-A-Fella Films.
Theodore Arrington III (born February 5, 1978), better known by his stage name Vast Aire, is an American rapper from New York City.
 He is one half of the New York hip hop duo Cannibal Ox, which consists of him and fellow rapper Vordul Mega.
 He is also a member of the rap group Atoms Family.
 He was born in Mount Vernon, New York, then lived in Jamaica, Queens before moving to Harlem, and became acquainted with the underground rap scene, performing in many clubs while still a teenager.
 He was once a part of the underground hip hop group The Weathermen.
Alberto Geddis "Alpo" Martinez (born June 8, 1966) is a Puerto Rican former drug dealer who rose to prominence alongside Azie Faison and Rich Porter in the mid 1980s in Harlem during the War on Drugs.
 He went on to expand his drug trade to other parts of New York City, and to other cities in the Northeast, notably Washington D.C. He was sentenced to a 35-year sentence for 14 counts of homicide at ADX Florence, a federal supermax prison located in Fremont County, Colorado.
 He was released into the Federal Witness Program in 2015.
Blade Icewood (March 14, 1977 – April 19, 2005), born Darnell Quincy Lindsay, was an American rapper from Detroit, Michigan.
 Icewood was raised on the westside of Detroit in the vicinity of 7 Mile Road & Evergreen.
 He was a member of the Street Lord'z rap group and is considered one of the most influential rappers in the Detroit underground rap genre.
 He was fatally shot on April 19, 2005, in gang related violence while at a car wash in the 7 Mile and Faust Rd area of westside Detroit.

Question: What is the name of the underground rap group that former American drug dealer who partnered with Rich Porter and Alpo Martinez founded?
Answer: MobStyle