William James Skardon (1904–1987) was a Special Branch officer who became an MI5 interrogator and head of "The Watchers" (physical surveillance teams).
 He was intimately involved with the investigation of the Cambridge Five and the interrogation of Klaus Fuchs.
Lev Vasilevsky (1904-1979), also known as Leonid A. Tarasov, was the KGB Mexico City Illegal Resident during much of the period of the Manhattan Project.
 In 1943, the Moscow Center of KGB intelligence activities in North America, decided all contacts with J. Robert Oppenheimer, scientific director of the Manhattan Project at Los Alamos laboratory, would be through 'illegals' only.
 Vasilevsky, operating from Mexico City, was put in charge of running the illegal network after New York Resident Vasily Zarubin had been recalled to Moscow.
 Vasilevsky's instructions were to control the network from the Mexico City Residentura.
 Bruno Pontecorvo was the conduit supplying the atomic secrets from Enrico Fermi.
 Vasilevsky provided Pontecorvo with an escape route through Finland which Pontecorvo used in 1950 after the arrest of Klaus Fuchs.
Richard Fuchs (] ), composer and architect, was born in Karlsruhe, Baden, Germany, on 26 April 1887 and died in Wellington, New Zealand, on 22 September 1947.
 The football player Gottfried Fuchs was his younger brother.
A K Peters, Ltd. was a publisher of scientific and technical books, specializing in mathematics and in computer graphics, robotics, and other fields of computer science.
 They published the journals "Experimental Mathematics", "Internet Mathematics", and the "Journal of Graphics Tools".
 The company was founded in 1992 by Alice and Klaus Peters.
 In 2010, A K Peters was acquired by CRC Press, which is owned by Taylor & Francis.
 In January 2012, Taylor & Francis unexpectedly terminated the employment of Alice and Klaus Peters.
 On July 7, 2014, Klaus Peters died.
Aphrica is a collaboration album by Klaus Schulze, Rainer Bloss and Ernst Fuchs, with the painter Fuchs providing vocals.
 "Aphrica" was both released and withdrawn in 1984.
 Although the reason the album was taken off the market was mainly legal (the label Inteam had "forgotten" to make a contract with Fuchs), Schulze had very little positive to say about the collaboration in retrospect: "Besides, it's an awful album, just because of that silly singing or recitation.
 Fuchs tries to be "serious", but he's only involuntarily funny.
 In Germany we have the word "peinlich" for it."
 The press seemed to agree.
 According to "tip", a Berlin-based magazine, "(...) due to their grandiloquent dimwittedness, the lyrics provoke only tormented laughter."
 (June 1984)
Emil Julius Klaus Fuchs (29 December 1911 – 28 January 1988) was a German theoretical physicist and atomic spy who, in 1950, was convicted of supplying information from the American, British, and Canadian Manhattan Project to the Soviet Union during and shortly after the Second World War.
 While at the Los Alamos National Laboratory, Fuchs was responsible for many significant theoretical calculations relating to the first nuclear weapons, and later, early models of the hydrogen bomb.
Aleksandr Semyonovich Feklisov (March 9, 1914 – October 26, 2007) was a Soviet spy, the NKGB Case Officer who received information from Julius Rosenberg and Klaus Fuchs, among others.
In physics and the philosophy of physics, quantum Bayesianism (QBism) is an interpretation of quantum mechanics that takes an agent's actions and experiences as the central concerns of the theory.
 This interpretation is distinguished by its use of a subjective Bayesian account of probabilities to understand the quantum mechanical Born rule as a normative addition to good decision-making.
 Rooted in the prior work of Carlton Caves, Christopher Fuchs, and Rüdiger Schack during the early 2000s, QBism itself is primarily associated with Fuchs and Schack and has more recently been adopted by David Mermin.
 QBism draws from the fields of quantum information and Bayesian probability and aims to eliminate the interpretational conundrums that have beset quantum theory.
 The QBist interpretation is historically derivative of the views of the various physicists that are often grouped together as "the" Copenhagen interpretation, but is itself distinct from them.
 Theodor Hänsch has characterized QBism as sharpening those older views and making them more consistent.
Ursula Kuczynski (15 May 1907, Schöneberg, Prussia, German Empire – 7 July 2000, Berlin, Germany, also known as Ruth Werner, Ursula Beurton and Ursula Hamburger) was a German Communist activist who worked for the Soviet Union in the 1930s and 1940s as a spy, most famously as the handler of nuclear scientist Klaus Fuchs.
 She moved to East Germany in 1950 when Fuchs was unmasked, and published a series of books related to her spy work, including her bestselling autobiography, "Sonjas Rapport".
The Cold War (1947–1953) is the period within the Cold War from the Truman Doctrine in 1947 to the conclusion of the Korean War in 1953.
 The Cold War began almost immediately following World War II and lasted through most of the 20th century.
 Political relations between the USA, Britain, Canada and the USSR were tainted within days of VJ-Day when cipher clerk Igor Gouzenko defected from the Soviet embassy in the Canadian capital, offering documentary proof of two wartime networks of Soviet spies in North America, one aimed at the Manhattan Project.
 In the next five years spies Julius and Ethel Rosenberg and Klaus Fuchs were exposed and British diplomats Guy Burgess and Donald Maclean defected to the Soviet Union.

Question: Who died more recently, Lev Vasilevsky, or Klaus Fuchs?
Answer: Klaus Fuchs