Question: What is the real name of the Soviet KGB spy whose release in exchange for U.S. Air Force pilot Francis Gary Powers was portrayed in the movie Bridge of Spies?

Context paragraphs:
Russians in Pakistan: Russians in Pakistan are a small expatriate community and consist entirely of students, employees, families and diplomats stationed inside the country.  During the nine-year Soviet occupation of Afghanistan, Moscow had attempted to establish a commercial and industrial presence in Pakistan, by opening an Aeroflot office and setting up subsidiaries of steel and oil industries as well as a tractor factory.  With only 56 Soviets in Pakistan in 1972, their numbers had suddenly jumped to 1,374 by 1980.  In his book, the French political expert Roland Jacquard mentions that Pakistani authorities, who were already opposed to the Soviet presence in Afghanistan, became alarmed by the burgeoning increase of the population and entailed the Soviets to reduce their diplomatic presence in Islamabad by half.  It has been alleged that during the time period, there was a strong presence of Soviet KGB agents in the country, who carried out spy work primarily from Peshawar and Islamabad in tandem with several hundred Afghan WAD agents, and monitored Pakistani aid to the Afghan mujahideen.  According to Jacquard, one of the Soviet Union's objectives was to bring Pakistan under its sphere of influence and even when a sizeable number of Soviet diplomats were removed from operations in the country, there were approximately one-third who still worked for the KGB spy agency.

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.

Judith Coplon: Judith Coplon Socolov (May 17, 1921 – February 26, 2011) was an alleged KGB spy whose trials, convictions and successful appeals had a profound influence on espionage prosecutions during the McCarthy era.  In 1949, three major cases against American communists started: Coplon's case (1949-1967), the Alger Hiss-Whittaker Chambers Case (1949-1950), and the Smith Act trials of Communist Party leaders (1949-1958).

1960 U-2 incident: The 1960 U-2 incident occurred during the Cold War on 1 May 1960, during the presidency of Dwight D. Eisenhower and the premiership of Nikita Khrushchev, when a United States U-2 spy plane was shot down while in Soviet airspace.  The aircraft, flown by Central Intelligence Agency pilot Francis Gary Powers was performing photographic aerial reconnaissance when it was hit by an S-75 Dvina (SA-2 Guideline) surface-to-air missile and crashed near Sverdlovsk.  Powers parachuted safely and was captured.

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.

Alexander Vassiliev: Alexander Vassiliev (Russian: Александр Васильев ; born 1962) is a Russian journalist, writer, and espionage historian living in London who is a subject matter expert in the Soviet KGB and Russian SVR.  A former officer in the Soviet Committee for State Security (KGB), he is known for his two books based upon KGB archival documents: "Spies: The Rise and Fall of the KGB in America", co-authored with John Earl Haynes and Harvey Klehr, and "The Haunted Wood: Soviet Espionage in America: the Stalin Era," co-authored with Allen Weinstein.

Francis Gary Powers: Francis Gary Powers (August 17, 1929 – August 1, 1977) – often referred to as simply Gary Powers – was an American pilot whose Central Intelligence Agency (CIA) U-2 spy plane was shot down while flying a reconnaissance mission in Soviet Union airspace, causing the 1960 U-2 incident.

KGB Security Troops: The KGB Security Troops were the uniformed paramilitary troops of the Soviet KGB which engaged in military-related activities that are not mentioned in legislation governing the Soviet Armed forces.  The KGB controlled elite units that guarded the highest party officials and stood a continuous ceremonial guard at the Lenin Mausoleum.  The special KGB signal troops also operated communications linking the party with the Ministry of Defense and the major territorial commands.  Another KGB armed force guarded sensitive military, scientific, and industrial installations in the Soviet Union and, until the late 1960s, controlled Soviet nuclear warhead stockpiles.  They also guarded government installations (nuclear weapons, etc.), operated the Moscow VIP subway (Russian journalists have reported that the existence of Metro-2 is neither confirmed nor denied by the Federal Security Service of the Russian Federation (FSB) or the Moscow Metro administration.) , and secured Government–Party telephone system.

Observer Badge: The Observer Badge is a military badge of the United States armed forces dating from the First World War.  The badge was issued to co-pilots, navigators, and flight support personnel who had received a variation in the training required for the standard Pilot's Badge.  The Observer Badge survived through the Second World War and into the 1950s, at which time the concept of an Observer Badge was phased out in favor of the modern Aircrew Badge and Navigator-Observer Badges.  In addition to wings for Naval Aviators and Naval Flight Officers, the United States Navy still maintains an "Observer Badge" which is issued to flight-qualified mission specialists, such as a select number of meteorologists and intelligence officers in both the U.S. Navy and U.S. Marine Corps.  The U.S. Air Force awards its USAF Observer Badge, which is identical to the USAF Navigator Badge, to Air Force officers who have qualified as NASA Space Shuttle Mission Specialists, have flown an actual mission aboard the shuttle and/or the International Space Station and who are otherwise not previously aeronautically rated as an Air Force pilot or navigator.

Austin Stowell: Austin Stowell (born December 24, 1984) is an American actor.  He is known for his roles in "Dolphin Tale", its sequel "Dolphin Tale 2", "Love and Honor" (2013), "Whiplash" (2014), and as Francis Gary Powers in Steven Spielberg's "Bridge of Spies" (2015).

Supporting paragraphs: Bridge of Spies (film) Rudolf Abel
Answer: Vilyam "Willie" Genrikhovich Fisher