Question: What was the popular nickname of the hip hop group that J.R. Writer joined?

Context paragraphs:
Run–D.M.C. (album): Run–D.M.C. is the debut studio album of American hip hop group Run–D.M.C..  Produced in 1984, it was considered groundbreaking for its time, presenting a harder, more aggressive form of hip hop.  The album's sparse beats and aggressive rhymes were in sharp contrast with the light, funky sound that was popular in hip hop at the time.  With the album, the group has been regarded by music writers as pioneering the movement of new school hip hop of the mid-1980s.  The album was reissued as a "Deluxe Edition" in 2005 with four bonus tracks.

Hip-hop in academia: Hip hop studies is a multidisciplinary field of study that encompasses sociology, anthropology, communication and rhetoric studies, religious studies, cultural studies, critical race theory, missiological studies, art history, dance, musicology, ethnomusicology, music theory, and gender studies.  The term "hip hop studies" began circulating in the mid-2000s, and though it is not clear who first coined the term to label the field, the field of hip hop studies is oft cited as having been crystallized by the publication of "That's the Joint! : The Hip Hop Studies Reader" in 2003.  "That's the Joint!"  includes approximately 25 years of scholarship, criticism, and journalism.  The publication of this anthology was unprecedented, and highlights the evolving and continuous influence of "one of the most creative and contested elements of global popular culture since its advent in the late 1970s."  The publication of the first edition of "That's the Joint!"  marked a consolidating moment for the field of hip hop studies because it brought together key writings on hip hop from a diversity of hip hop authorities.

Serbian hip hop: Serbian hip hop refers to all genres of hip hop music in the Serbian language.  The term is also sometimes used to refer to any hip hop music made by Serbs, including instrumental hip hop, as well as rap songs by members of the Serbian diaspora, often in languages other than Serbian.  Beogradski Sindikat is considered to be the greatest Serbian hip hop group, along with others like VIP, Sunshine, CYA.  The most popular solo artists are Skabo, Ikac, Reksona, Juice, Gru, Struka, Ajs Nigrutin, Marchelo, etc.

McGruff (rapper): Herbert Brown, better known by his stage name McGruff (also known as Herb McGruff) is an American Hip hop recording artist from Harlem, New York City, New York.  Brown started rapping in his early teens.  He embarked on his music career in the hip hop group Bronx Most Wanted, alongside rappers Jay Q and Tee U.B. Brown later became a member of the hip hop collective Children of the Corn.  As a member of Children of the Corn, Brown worked alongside Big L, Cam'ron, Bloodshed and Mase, all of whom would go on to have successful careers in the music industry.  After the group disbanded without releasing any material, Brown made his first appearance on Big L's debut album, "Lifestylez ov da Poor & Dangerous" (1995), on the tracks "8 Iz Enuff" and "Dangerzone".  Eventually, Brown signed a deal with popular hip hop label, Uptown Records and began recording his debut album, "Destined to Be".  In early 1998, the album's lead single "Before We Start" became a minor hit, charting on several "Billboard" charts.  In the Summer of 1998, "Destined to Be" was released but failed to sell many copies, only peaking at 169 on the "Billboard" 200, and Brown was released from his contract.  Brown would make appearances with Heavy D on his album, "Waterbed Hev" and the "Woo" soundtrack.  In 2009, Brown appeared on Mase's mixtape "I Do the Impossible".  In 2010, he was featured heavily on The Diplomats mixtape, "The D.I.P. Agenda."  In 2014, DJ Kay Slay, enlisted Brown, along with Raekwon, Fat Joe, Ghostface Killah, Sheek Louch, N.O.R.E., Lil' Fame, Prodigy and Rell, for a song titled "90s Flow".

Mr. J. Medeiros: Jason C. Medeiros better known as Mr. J. Medeiros, is an American Rapper, Record Producer, and Songwriter.  As well as releasing music under the name, Mr. J. Medeiros, he is responsible for forming the Hip Hop group The Procussions, is one half of the Hip Hop/Electronic duo AllttA, and the lead singer of Punk-Rap group KNIVES.  He is of Portuguese and Scottish descent.  Mr. J. has written music with such artists as, Monte Nueble, Noel Zancanella, Randy Jackson, Marty James, Shad (rapper), George "Spanky" McCurdy, Symbolyc One (S1), Illmind, Benny Cassette, Talib Kweli, 20Syl and French hip hop group Hocus Pocus (group) and more famous C2C.

J.R. Writer: Juan Rusty Brito (born May 28, 1984) better known by his stage name J.R. Writer, is a Dominican American hip hop recording artist and freestyle champion.  He is from Harlem, New York.  He was also a member of East Coast hip hop group The Diplomats.  On March 18, 2014, J.R. Writer began a prison sentence at Ulster Correctional Facility, in New York State.

The Diplomats: The Diplomats (popularly known as Dipset) were an American hip hop group founded in 1997 by Cam'ron and Jim Jones, in Harlem, New York City.  The group was originally composed of members Cam'ron, Jim Jones and Freekey Zekey, all of whom grew up together in Harlem.  In 1999, fellow Harlem-based rapper Juelz Santana was added to the group.

Uptown 3000: Uptown 3000 was a Korean American hip hop duo on the record label The Machine Group CEO Alvin & Calvin Waters which consisted of Carlos Galvan aka "Cali-Mexci" and Steve Kim aka "Kwon".  The duo was a spinoff of Uptown, a Korean hip hop group which was active in the late 1990s whose sales reached 6 million.  The duo is considered defunct as the original Uptown made its comeback in Korea in 2006, which Kim and Galvan were a part of.  The group has been credited with being the first Korean hip hop group to closely resemble anything similar to American style hip hop.

Optimus Rhyme: Optimus Rhyme was a hip hop group from Seattle, Washington.  Optimus Rhyme is most widely considered a nerdcore hip hop group because of the nerdy nature of their lyrics.  The name of the band as well as the stage names of the members and a majority of their lyrics refer to the Transformers franchise.  Their music is a combination of rapped hip hop lyrics with funk rock music.  Optimus Rhyme formed in Seattle in 2001.

Orishas (band): Orishas are a Cuban hip hop group from Havana, Cuba, founded in 1999.  The group was first called ""Amenaza"", ""threat"" or ""menace"" in Spanish, and appealed to the Cuban youth who were hungry for African-American culture consisting of hip hop and rap.  Orishas delved into a realm of music and that they created a black identity to which some among the younger generations could relate.  The group is based in France where they made a deal with a record company, although they visit Cuba frequently.  In 1999 Fidel Castro threw a party for them and had a meeting with all the musicians.  It was the first time the Cuban government showed support for hip hop music.  The group was and still is popular in Europe (especially France, Spain and Portugal) and Latin America.  Yotuel Romero and Ruzzo Medina, who moved from Havana to Paris as part of an international studies program, joined Roldán González and Flaco-Pro to form the band in 1999.  Their work is influenced by the hip hop movement as well as Cuban and other Latin rhythms.  s of 2009 , they had produced a total of four studio albums and a greatest hits album; their latest album is Cosita Buena (released June 17, 2008).  In 2009 they participated in the concert Paz Sin Fronteras II in Plaza de la Revolución, Havana, Cuba.  Orishas reunited to record new material in 2016.

Supporting paragraphs: J.R. Writer The Diplomats
Answer: Dipset