Question: Lesra Martin brought about the release of what middleweight boxer?

Context paragraphs:
Kevin Kelly (boxer): Kevin "Bones" Kelly (born August 7, 1969 in La Perouse, New South Wales) is an Australian retired professional welter/light middle/middleweight boxer of the 1990s and 2000s who won the South Australia State welterweight title, New South Wales (Australia) State welterweight title, New South Wales (Australia) State light middleweight title, Australian light middleweight title, Pan Asian Boxing Association (PABA) light middleweight title, World Boxing Union (WBU) middleweight title, and Commonwealth light middleweight title (twice), and was a challenger for the World Boxing Association (WBA) World light middleweight title against David Reid, and World Boxing Organization (WBO) Inter-Continental light middleweight title against Gary Lockett, his professional fighting weight varied from 142 lb , i.e. welterweight to 158+1/4 lb , i.e. middleweight.

Michael Jones (boxer): Michael Jones, nicknamed "The Destiny" (born 14 November 1974 in Liverpool) is an English amateur light middleweight and professional light middle/middle/super middleweight boxer of the 1990s and 2000s who as an amateur won the 1991 Amateur Boxing Association of England (ABAE) 57 kg Schools title, against Jason Kilgannon (Middlesex) and was runner-up for the 1997 Amateur Boxing Association of England (ABAE) light middleweight (71 kg) title, against Chris Bessey (The Army) boxing out of Gemini ABC, and as a professional won the British Boxing Board of Control (BBBofC) British light middleweight, and Commonwealth light middleweight title, and was a challenger for the European Boxing Union (EBU) light middleweight title against Michele Piccirillo, his professional fighting weight varied from 153+1/2 lb , i.e. light middleweight to 165+1/2 lb , i.e. super middleweight.  Michael Jones was trained by Maurice Core, and managed by Jack Trickett.

Al Korovou: Alipate "Al" Korovou born in Lakeba, Lau Islands is a Fijian professional middle/super middleweight boxer of the 1970s who won the New South Wales (Australia) State middleweight title, Australian middleweight title, Australian super middleweight title, and Commonwealth middleweight title, his professional fighting weight varied from 156+1/2 lb , i.e. middleweight to 166 lb , i.e. super middleweight.

Leo Young (boxer): Leo Young Jr ( (1969--) 12 1969 (age (2017)-(1969)-((11)<(02)or(11)==(02)and(30)<(12)) ) ) born in Victoria is an Australian professional light middle/middleweight boxer of the 1990s who won the Victoria (Australia) State light middleweight title, Victoria (Australia) State middleweight title, Australian light middleweight title, and Commonwealth light middleweight title (twice), his professional fighting weight varied from 152 lb , i.e. light middleweight to 158+1/4 lb , i.e. middleweight.

Rubin Carter: Rubin "Hurricane" Carter (May 6, 1937 – April 20, 2014) was a middleweight boxer who was wrongfully convicted of murder and later released following a petition of habeas corpus after spending almost 20 years in prison.

Johnson Tshuma: Johnson Tshuma ( (1970--) 30 1970 (age (2017)-(1970)-((11)<(09)or(11)==(09)and(30)<(30)) ) ) is a Zimbabwean professional light middle/middleweight boxer of the 1990s who won the Natal (South Africa) Middleweight Title, South African middleweight title, and Commonwealth middleweight title, and was a challenger for the South African light middleweight title against Mpush Makambi, his professional fighting weight varied from 151+1/2 lb , i.e. light middleweight to 160 lb , i.e. middleweight.

Lesra Martin: Lesra Martin is a Canadian lawyer and motivational speaker.  He is known for helping to bring about the release of boxer Rubin "Hurricane" Carter.

Richard Williams (boxer): Richard "The Secret" Williams ( (1971--) 09 1971 (age (2017)-(1971)-((11)<(05)or(11)==(05)and(30)<(09)) ) is an English professional light middle/middle/super middleweight boxer of the 1990s, 2000s and 2010s who won the International Boxing Organization (IBO) light middleweight title, and Commonwealth light middleweight title (twice), and was a challenger for the International Boxing Organization (IBO) light middleweight title against Sergio Gabriel Martinez, and British Boxing Board of Control (BBBofC) British middleweight title against Howard Eastman, his professional fighting weight varied from 149+3/4 lb , i.e. light middleweight to 162+1/4 lb , i.e. super middleweight.  Richard Williams is trained by Brian Lawrence, and managed by Barry Hearn, and John Rooney.

Nicky Wilshire: Nicky Wilshire ( (1961--) 03 1961 (age (2017)-(1961)-((11)<(11)or(11)==(11)and(30)<(03)) ) ) born in Bristol is an English amateur light middle/middleweight and professional light middle/middleweight boxer of the 1970s and '80s who as an amateur won the 1979 Amateur Boxing Association of England (ABAE) middleweight title, against Douglas James (Royal Antediluvian Order of Buffaloes (RAOB) ABC) (Llanelli/Swansea), boxing out of National Smelting Company ABC  (Avonmouth), was runner-up in the 1980 Amateur Boxing Association of England (ABAE) light middleweight title, against James Price (Holy Name ABC) (Fazakerley, Liverpool), boxing out of National Smelting Company ABC  (Avonmouth), and represented Great Britain at light middleweight in the Boxing at the 1980 Summer Olympics in Moscow, Soviet Union, defeating Miodrag Perunović of Yugoslavia, and losing to eventual silver medal winner Aleksandr Koshkyn of the Soviet Union, and as a professional won the Commonwealth light middleweight title, and was a challenger for the British Boxing Board of Control (BBBofC) British light middleweight title against Jimmy Cable, and Lloyd Hibbert, his professional fighting weight varied from 152+3/4 lb , i.e. light middleweight to 158 lb , i.e. middleweight.

Alexander Ireland: Alexander "Alex" Ireland (10 April 1901 – 25 January 1966) was a Scottish amateur and professional welter/middleweight boxer of the 1920s and 1930s, who was the 1921 Amateur Boxing Association of England (ABA) welterweight champion.  He also won a silver medal in the welterweight boxing at the 1920 Summer Olympics in Antwerp, Belgium losing to Canadian boxer Bert Schneider in the final, and the Scottish Area welterweight title, the National Sporting Club (NSC) (subsequently known as the British Boxing Board of Control (BBBofC)) British middleweight title, British Empire middleweight title, and European Boxing Union (EBU) middleweight title.  He was a challenger for the Scottish Area middleweight title and his professional fighting weight varied from 146 lb , i.e. welterweight to 151 lb , i.e. middleweight.  He was born in Leith.

Supporting paragraphs: Lesra Martin Rubin Carter
Answer: Rubin "Hurricane" Carter