Anthony P. ("Tony") Serka, QC (born 1944) is a British Columbia lawyer who has appeared as counsel on several significant and high profile criminal cases, including in the Supreme Court of Canada.
 In "R. v. Hutt", [1978] 2 S.C.R. 476, Serka acted for a Vancouver woman accused of soliciting.
 As a result of the court's decision, the meaning of the word "solicit" was narrowed.
 The case was noted by the "Canadian Lawyer" magazine to have been one of the rare decisions which left "lasting impressions on the legal and sociological landscape."
 Serka also appeared in "R. v. Smith", [1987] 1 S.C.R. 1045, which was the first decision to deal with minimum sentencing laws after the advent of the Canadian Charter of Rights and Freedoms.
 Serka was successful in overturning the seven-year minimum sentence provision for importation of narcotics.
 In reaching its decision, the court in "Smith" elaborated on the meaning of "cruel and unusual punishment" under section 12 of the Charter.
Paul Grimes (born 26 May 1950) is a former gangster who, from an early age, was active in Liverpool's criminal underworld.
 He has 38 criminal convictions and was involved in a range of violent and illegal activities.
 He also set up legal businesses recycling scrap metal and disposing of waste.
 He was rich, successful and at the top of the gangster hierarchy when his son Jason died of a heroin overdose in 1992, at the age of 21.
 This tragedy led to Grimes becoming a police informer with the aim of bringing down the drug dealers who he felt had destroyed his son's life.
 His evidence has led to successful prosecutions against high-profile dealers such as John Haase and Curtis Warren.
 The information Grimes provided also led to his son Heath being jailed for five years.
Jeremy Dein QC (born 29 June 1960) is an English barrister specializing in criminal defence.
 He has defended many high profile cases, including Tulisa Contostavlos where he succeeded in persuading the trial judge to bring to an end the first ever case of non-stage agent entrapment The main prosecution witness, the “"Fake Sheikh"”, Mazher Mahmood, was referred to the DPP for possible perjury charges following Jeremy’s cross-examination.
 Other high profile cases include McCluskie: The "EastEnders" case, where his defendant was accused of having murdered and dismembered Gemma McCluskie, his sister and a former EastEnders star.
William Leavitt (born 1941) is a conceptual artist known for paintings, photographs, installations, and performance works that examine "the vernacular culture of L.A. through the filter of the entertainment industry...drawing on 'stock environments' and designs of films as well as the literature of the place."
 A critical figure in the West Coast conceptual art movement of the late 60s, Leavitt himself has managed to maintain a low profile.
 "Over the last 40 years, William Leavitt has made a name for himself as an influential artist while staying so far out of fame's spotlight that his hard-to-categorize works have been all but invisible to the public," wrote the "LA Times".
 While his work is collected by high profile artists such as John Baldessari and Mike Kelley (who donated Leavitt works to the Museum of Contemporary Art, Los Angeles), Leavitt himself has eschewed celebrity.
Justin Hopson is a retired New Jersey State Trooper, licensed private investigator, whistle-blower, and author of ""Breaking the Blue Wall: One Man's War Against Police Corruption.""
 As a rookie state trooper, Justin Hopson witnessed an unlawful arrest and false charges of a woman made by his training officer, so Hopson refused to testify in court supporting the arrest.
 As a result, Trooper Hopson was targeted by a rogue group of troopers known as the Lords of Discipline or "LOD."
 The LOD bullied and hazed fellow troopers for decades until Justin Hopson blew the whistle.
 Hopson brought tangible evidence and a written chronology of events that occurred to internal affairs and the attorney general's office...which sparked the largest internal investigation in state police history and high profile federal case (Hopson v State of New Jersey #1:03-CV-5817).
 "I was an ordinary cop with an extraordinary cause.
 My cause is constant - to unearth corruption by shining a light on integrity," says Hopson.
World of Hell (or simply WoH) was a grey hat computer hacker group that claims to be responsible for several high profile attacks in the year 2001.
 It gained attention due to its high profile targets and the lighthearted messages it has posted in the aftermath of its attacks.
Abdelkader Guerroudj, an Algerian, and his French wife, Jacqueline Guerroudj, were condemned to death in December 1957 as accomplices of Fernand Iveton, the only European who was guillotined for his part in the Algerian revolt.
 As a result of a high profile campaign in France, where the issue was called "L'Affaire Guerroudj", neither was executed.
Lulz Security, commonly abbreviated as LulzSec, was a black hat computer hacking group that claimed responsibility for several high profile attacks, including the compromise of user accounts from Sony Pictures in 2011.
 The group also claimed responsibility for taking the CIA website offline.
 Some security professionals have commented that LulzSec has drawn attention to insecure systems and the dangers of password reuse.
 It has gained attention due to its high profile targets and the sarcastic messages it has posted in the aftermath of its attacks.
 One of the founders of LulzSec was computer security specialist Hector Monsegur, who used the online moniker Sabu.
 He later helped law enforcement track down other members of the organization as part of a plea deal.
 At least four associates of LulzSec were arrested in March 2012 as part of this investigation.
 British authorities had previously announced the arrests of two teenagers they allege are LulzSec members T-flow and Topiary.
Curtis Francis Warren (born 31 May 1963) is an English gangster, who as Britain's most notorious drugs trafficker was formerly Interpol's Target One, and once listed on the Sunday Times Rich List.
This is the production discography of hip-hop producer Rockwilder.
 Rockwilder first began producing through an affiliation with rapper Redman and fellow producer Erick Sermon.
 His first career productions came in the year 1994, when he produced many songs on the Flatlinerz' debut album "U.S.A.", and also for Redman and Organized Konfusion.
 His profile rose greatly after he produced Method Man & Redman's "Da Rockwilder" and Jay-Z's hit "Do It Again (Put Ya Hands Up)."
 In the early decade, he would make contributions to many high profile artist's albums.
 He notably produced several songs and remixes for Janet Jackson's "All for You", bringing his productions into mainstream pop.

Question: Which high profile dealer was prosecuted as a result of Paul Grimes being an informer?
Answer: Curtis Warren