During the 1930s and 1940s Joseph Stalin's NKVD carried out numerous assassinations outside of the Soviet Union, such as the killings of Organization of Ukrainian Nationalists leader Yevhen Konovalets, Ignace Poretsky, Fourth International secretary Rudolf Klement, Leon Trotsky, and the Workers ' Party of Marxist Unification ( POUM ) leadership in Catalonia.

During the 1940s Haley was considered one of the top cowboy yodelers in America as " Silver Yodeling Bill Haley ".

During the 1940s and 50s the attendance was often above 40, 000, and Charlton had one of the largest support bases in the country.

During the 1940s Alston also took occasional art classes studying under Alexander Kostellow.

During the 1930s and early 1940s, Alston created illustrations for magazines such as Fortune, Mademoiselle, The New Yorker, Melody Maker and others.

During the 1940s and 1950s, Casablanca was a major centre of anti-French rioting.

During the 1940s The Living Theatre, Theatre of the Absurd, and the Downtown Theater movement all took root there, and it developed a reputation as a place where aspiring playwrights and emerging voices could showcase their work.

During the late 1930s and through the 1940s — the heyday of big band jazz and swing music — the guitar was an important rhythm section instrument.

During the 1940s, Cousteau is credited with improving the aqua-lung design which gave birth to the open-circuit scuba technology used today.

During the 1940s, Kirby, generally teamed with Simon, created numerous characters for that company and for the company that would become DC Comics.

During the 1940s, English knitting rose in popularity while Continental knitting fell.

During the 1940s and 1950s, critics focused on the technique of the poem and how it relates to the meaning.

During the late 1940s and into the 1950s, a production unit at Metro-Goldwyn-Mayer headed by Arthur Freed made the transition from old-fashioned musical films, whose formula had become repetitive, to something new.

During the late 1940s Jackson Pollock's radical approach to painting revolutionized the potential for all contemporary art that followed him.

During the latter half of the 1940s, Friedman began a collaboration with Anna Schwartz, an economic historian at the Bureau, that would ultimately result in the 1963 publication of a book co-authored by Friedman and Schwartz, A Monetary History of the United States, 1867 – 1960.

During this period, the logo of the club was the Beer Barrel Man, which had been used by the American Association Milwaukee Brewers since at least the 1940s.

During the 20th century the tradition was reinvigorated by Captain America and his fellow Invaders in the 1940s, who fought for the Allies of World War II.

During the 1930s and 1940s, the state passed labor laws, implemented agrarian reform, and assumed a role in modernization, influenced in part by the leadership of Juan Domingo Perón in Argentina and Getúlio Dornelles Vargas in Brazil.

During the 1930s and 1940s, Heinlein was deeply interested in Alfred Korzybski's General Semantics and attended a number of seminars on the subject.

During the early 1940s, Rickenbacker amps were sometimes repaired by Leo Fender, whose repair shop evolved into the Fender Electric Instrument Manufacturing Company.

During the 1930s and 1940s, Jews in Nazi-controlled states were made to wear yellow ribbons or stars of David, and were, along with Romas ( Gypsies ), discriminated against by the racial laws.

During the 1940s and 1950s, Frederick Terman, as dean of engineering and provost, encouraged faculty and graduates to start their own companies.

During the 1930s and 1940s, Coarsegold and Bass Lake were still populated with descendants of the miners and ranchers of the 19th century.

During the first half of the 1940s, Charteris cast Templar as a willing operative of the American government, fighting Nazi interests in the U. S. during World War II.

During most of the late 1930s and early 1940s Milligan performed as an amateur jazz vocalist and trumpeter before, during and after being called up for military service in the fight against Nazi Germany, but even then he wrote and performed comedy sketches as part of concerts to entertain troops.

During the 19th century, the fields of science and art became increasingly intertwined as scientists such as Michael Faraday began to study the damaging effects of the environment to works of art.

During the spring of 1798, Bonaparte assembled over 35, 000 soldiers in Mediterranean France and Italy and developed a powerful fleet at Toulon ; he also formed the Commission des Sciences et des Arts, a body of scientists and engineers intended to establish the French colony in Egypt.

During this period, which has been called " the eclipse of Darwinism ", scientists proposed various alternative evolutionary mechanisms which eventually proved untenable.

During the development of radio, many scientists and inventors contributed to radio technology and electronics.

During their working life, electrical engineers may find themselves supervising a wide range of individuals including scientists, electricians, computer programmers and other engineers.

During World War II, he worked for the Admiralty Research Laboratory, from which emerged a group of many notable scientists, including David Bates, Robert Boyd, George Deacon, John Gunn, Harrie Massey, and Nevill Mott ; he worked on the design of magnetic and acoustic mines, and was instrumental in designing a new mine that was effective against German minesweepers.

During an international space symposium in May 1966, attended by space scientists from the United States and Soviet Union, he first proposed that manned landings on the moons would be a logical step after a manned landing on the Earth's moon.

During the period of time known as the Dark Ages ( 5th – 15th century ), Arabic scholars and scientists progressed science and technology while Europe was in cultural decline and poverty.

During this time he grew in fame even in the public consciousness, becoming one of the best-known scientists in the world.

During the early modern period, scientists such as Galileo, Kepler, and especially Newton, laid the foundation for what is now known as classical mechanics.

During the next several decades multiple scientists, including Sydney Chapman and Hannes Alfvén, proposed a variety of mechanisms and explanations.

During the first half of the nineteenth century, scientists realized that organic compounds can be synthesized in the laboratory.

During his master studies, Mehmood had read scientific reports of the " Manhattan Project " while receiving his training at the Birmingham University, where he also had an opportunity to discuss enrichment technology with scientists from South Africa, who were then exploring the jet-nozzel aerodynamic process of enrichment.

During the aftermath of World War II the American, Soviet and British governments all gained access to the V-2's technical designs and the actual German scientists responsible for creating the rockets, via Operation Paperclip, Operation Osoaviakhim and Operation Backfire respectively.

During the Manhattan Project, Los Alamos hosted thousands of employees, including many Nobel Prize-winning scientists.

During the late-1950s, a number of scientists including Dr. J. Robert " Bob " Beyster left Los Alamos to work for General Atomics ( GA ) in San Diego.

During this Austrian period the University was greatly supported by Maria Theresa of Austria and saw a great renaissance that eventually led to a second renaissance due to the presence of leading scientists and humanists like Ugo Foscolo, Alessandro Volta, Lazzaro Spallanzani, Camillo Golgi among others.

During the Second World War German scientists researched an orbital weapon that could utilize the sun's energy.

During the early 19th century, many scientists began to disregard the corpuscular theory in favor of the wave theory of light.

During the war he stole plans for the " nullatron ," a device that could control human minds, adapted a space-warping device developed by the cyborg scientist codenamed Brain Drain, and commissioned Nazi scientists to develop a projector which could encircle and suspend sections of cities within spheres of energy.

During the Manhattan Project to develop the atomic bomb in the early 1940s, many scientists investigated the toxic properties of uranium.

During the Abbasid caliphate a number of thinkers and scientists, some of them heterodox Muslims or non-Muslims, played a role in transmitting Greek, Hindu, and other pre-Islamic knowledge to the Christian West.

During the Abbasid caliphate a number of thinkers and scientists, some of them heterodox Muslims or non-Muslims, played a role in transmitting Greek, Hindu, and other pre-Islamic knowledge to the Christian West.

During the heyday of the gentleman scientists, many figures contributed to both fields, and early papers in both were commonly read at professional science society meetings such as the Royal Society and the French Academy of Sciences – both founded during the seventeenth century.