Question: What former Federal Bureau of Investigation agent is the film Breach based on?

full_context: Document 1: Attorney General v Blake: George Blake was a former member of the Secret Intelligence Service (MI6) from 1944 to 1961. For his employment contract, he had signed an Official Secrets Act 1911 declaration to disclose no information about his work. It applied after his employment ceased. In 1951, he became a Soviet agent, thus, being a double agent. He was discovered in 1961 and the British government imprisoned him in Wormwood Scrubs (HM Prison). He escaped in 1966 and fled to the Soviet Union. He wrote a book about it and his secret services work called "No Other Choice". He received a publishing contract for its release in 1989, with Jonathan Cape Ltd. The information in the book was no longer confidential. Blake received advanced payments and was entitled to more. The Crown brought an action for all the profits he made on the book including those that he had not yet received. It argued a restitutionary principle should apply.
Document 2: Jack Ryan (FBI agent): John C. "Jack" Ryan (born 19 June 1938) is a former FBI agent and police officer. He had been an FBI agent between 1966 and 1987 before being fired for refusing to investigate nonviolent activists. He lost his job in September 1987 ten months short of retirement. He was thus ineligible for a full pension and had to live in a homeless shelter. In a report by the "LA Times", he stated his belief that the Bureau could reinstate him to a position which would not conflict with his personal beliefs that U.S. involvement in Central America is "violent, illegal and immoral."
Document 3: Rudolf Abel: Rudolf Ivanovich Abel (Russian: Рудольф Иванович Абель ), real name Vilyam "Willie" Genrikhovich Fisher (Вильям "Вилли" Генрихович Фишер), (July 11, 1903 – November 15, 1971) was a Soviet intelligence officer. He adopted his alias when arrested on charges of conspiracy by FBI agents in 1957.
Document 4: Robert Levinson: Robert Alan "Bob" Levinson (born March 10, 1948) is an American former Drug Enforcement Administration and Federal Bureau of Investigation agent who disappeared mysteriously in 2007 in Kish Island, Iran. He is believed to be currently held captive by the government of Iran. He disappeared on March 9, 2007, when visiting Iran's Kish Island while supposedly researching a cigarette smuggling case. U.S. officials believed Levinson had been arrested by Iranian intelligence officials to be interrogated and used as a bargaining chip in negotiations with Washington. But as every lead fizzled and Iran repeatedly denied any involvement in his disappearance, many in the U.S. government believed Levinson was probably dead. He was subsequently revealed to be alive. On December 12, 2013, the Associated Press reported that their investigations revealed that Levinson had been working for the Central Intelligence Agency (CIA), contradicting the U.S.'s statement that he was not an employee of the government at the time of his capture.
Document 5: Benjamin B. Fischer: Benjamin B. Fischer has worked for the United States Central Intelligence Agency (CIA) for nearly 30 years. In recent years, he has been employed by the CIA's Center for the Study of Intelligence. The White House Millennium Council selected his monograph "At Cold War's End: US Intelligence on the Soviet Union and Eastern Europe", 1989-1991 (1999) for inclusion in a time capsule at the National Archives to be opened in 2100. In 2002, Fischer was a visiting research fellow at the Norwegian Nobel Institute in Oslo.
Document 6: Tinker Tailor Soldier Spy (film): Tinker Tailor Soldier Spy is a 2011 Cold War espionage film directed by Tomas Alfredson. The screenplay was written by Bridget O'Connor and Peter Straughan, based on John le Carré's 1974 novel of the same name. The film, starring Gary Oldman as George Smiley, along with Colin Firth, Tom Hardy, John Hurt, Toby Jones, Mark Strong, Benedict Cumberbatch, and Ciarán Hinds, and featuring David Dencik, is set in London in the early 1970s and follows the hunt for a Soviet double agent at the top of the British secret service.
Document 7: Kim Philby: Harold Adrian Russell "Kim" Philby (1 January 1912 – 11 May 1988) was a high-ranking member of British intelligence who worked as a double agent before defecting to the Soviet Union in 1963. He served as both an NKVD and KGB operative.
Document 8: Aldrich Ames: Aldrich Hazen Ames (born May 26, 1941) is a former Central Intelligence Agency (CIA) officer turned KGB mole, who was convicted of espionage in 1994. He is serving a life sentence without the possibility of parole in the Federal Correctional Institution in Terre Haute, Indiana, United States. Ames was formerly a 31-year CIA counterintelligence analyst who committed espionage against the U.S. by spying for the Soviet Union and Russia. At the time of his arrest, Ames had compromised more CIA assets than any other mole in history until Robert Hanssen's arrest seven years later.
Document 9: American Assassin: American Assassin is a 2017 American action thriller film directed by Michael Cuesta and written by Stephen Schiff, Michael Finch, Edward Zwick and Marshall Herskovitz, based on Vince Flynn's 2010 novel of the same name. The film stars Dylan O'Brien, Michael Keaton, Sanaa Lathan, Shiva Negar and Taylor Kitsch, and follows young CIA black ops recruit Mitch Rapp, who helps a Cold War veteran try to stop the detonation of a rogue nuclear weapon.
Document 10: The Bourne Ultimatum (film): The Bourne Ultimatum is a 2007 American-German action spy thriller film directed by Paul Greengrass loosely based on the novel of the same name by Robert Ludlum. The screenplay was written by Tony Gilroy, Scott Z. Burns and George Nolfi and based on a screen story of the novel by Gilroy. "The Bourne Ultimatum" is the third in the "Jason Bourne" film series, being preceded by "The Bourne Identity" (2002) and "The Bourne Supremacy" (2004). The fourth film, "The Bourne Legacy", was released in August 2012, without the involvement of Damon, and the fifth film (a direct sequel to "Ultimatum"), "Jason Bourne", was released in July 2016.
Document 11: Shooter (2007 film): Shooter is a 2007 American conspiracy action thriller film directed by Antoine Fuqua based on the novel "Point of Impact" by Stephen Hunter. The film follows Force Recon veteran Bob Lee Swagger (Mark Wahlberg), who is framed for murder by a rogue secret private military company unit. The film also stars Michael Peña, Danny Glover, Kate Mara, Levon Helm, and Ned Beatty and was released in the United States on March 23, 2007.
Document 12: Robert Hanssen: Robert Philip Hanssen (born April 18, 1944) is a former Federal Bureau of Investigation (FBI) agent who spied for Soviet and Russian intelligence services against the United States for 22 years from 1979 to 2001. He is currently serving 15 consecutive life sentences at ADX Florence, a federal supermax prison near Florence, Colorado.
Document 13: Bridge of Spies (film): Bridge of Spies is a 2015 historical drama legal thriller film directed and co-produced by Steven Spielberg, written by Matt Charman, Ethan and Joel Coen and stars Tom Hanks, Mark Rylance, Amy Ryan, and Alan Alda. Set during the Cold War, the film tells the story of lawyer James B. Donovan, who is entrusted with negotiating the release of Francis Gary Powers—a U.S. Air Force pilot whose U-2 spy plane was shot down over the Soviet Union in 1960—in exchange for Rudolf Abel, a convicted Soviet KGB spy held under the custody of the United States, whom he represented at trial. The name of the film refers to the Glienicke Bridge, which connects Potsdam with Berlin, where the prisoner exchange took place. The film was an international co-production of the United States and Germany.
Document 14: Breach (film): Breach is a 2007 American historical and political thriller film directed by Billy Ray. The screenplay by Ray, Adam Mazer and William Rotko is based on the true story of Robert Hanssen, an FBI agent convicted of spying for the Soviet Union and later Russia for more than two decades, and Eric O'Neill, who worked as his assistant and helped bring about his downfall. O'Neill served as a consultant on the film. The film received generally positive reviews.
Document 15: Robert Lindsey (journalist): Robert Lindsey (born 1935) is a journalist and author of several true crime books, including "The Falcon and the Snowman: A True Story of Friendship and Espionage" (1980), the story of Christopher John Boyce and Andrew Daulton Lee, who were both convicted of selling information to the Soviets. "" (1983) followed, a chronology of Christopher Boyce's escape from Federal prison and subsequent bank robbing spree.
ground_truth: Robert Philip Hanssen