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 late 1930s, Onsager researched the dipole theory of dielectrics, making improvements for another topic that had been studied by Peter Debye.

During his University of Miami career, he hosted several Nobel Prize laureates, including Paul Dirac, Lars Onsager and Robert Hofstadter.

During the last decade, he has received the Quantrell Award ( for excellence in teaching ) from the University of Chicago, the Centennial Medal of Harvard University, the Onsager Prize of the American Physical Society, and the Grande Medaille d ' Or of the Academy des Sciences de l ' Institut de France.

During this time, the boy also studied calligraphy and Kendo swordsmanship.

During the summers of 1936 and 1937, Lerner studied at Juilliard.

During the sixth century, some of the most significant names in the history of Irish Christianity studied at the Clonard monastery.

During the 1980s, Allan Bromley, an associate professor at the University of Sydney, Australia, studied Babbage's original drawings for the Difference and Analytical Engines at the Science Museum library in London.

During his travels, Bacon studied language, statecraft, and civil law while performing routine diplomatic tasks.

During the Middle Ages, passages from the Sefer Yetzirah ( Book of Creation ) were studied as a means to attain the mystical ability to create and animate a golem, although there is little in the writings of Jewish mysticism that supports this belief.

During this period Ford also studied bookkeeping at Goldsmith, Bryant & Stratton Business College in Detroit.

During this period, Nehru also studied politics, economics, history and literature desultorily.

During his teens, Kurt studied Gabelsberger shorthand, Goethe's Theory of Colours and criticisms of Isaac Newton, and the writings of Immanuel Kant.

During 1933 – 34 he had a fellowship at Columbia University, where he studied statistics with renowned statistician and economist Harold Hotelling.

During that time, Maria studied both differential and integral calculus.

To eliminate any possible doubts, Nichiren decided to spend some time at Mount Kōya, the centre of esoteric Buddhism, and also in Nara, Japan ’ s ancient capital, where he studied the Ritsu sect, which emphasized strict monastic discipline and ordination. During this time, he became convinced of the pre-eminence of the Lotus Sutra and in 1253, returned to Seichoji.

During World War II, social psychologists studied persuasion and propaganda for the U. S. military

During this period he studied under, among others, Alexander Winkler, Anatoly Lyadov, Nikolai Tcherepnin and Nikolai Rimsky-Korsakov ( though when Rimsky-Korsakov died in 1908, Prokofiev noted that he had only studied orchestration with him ' after a fashion ' – that is, he was just one of many students in a heavily attended class — and regretted that he otherwise ' never had the opportunity to study with him ').

During this time, he also studied abroad at the University of Leeds in the United Kingdom.

During the Renaissance the dynamics of the Mechanical Powers, as the simple machines were called, began to be studied from the standpoint of how much useful work they could perform, leading eventually to the new concept of mechanical work.

During his graduate student years, he studied under Professor Gerald Estrin, worked in Professor Leonard Kleinrock's data packet networking group that connected the first two nodes of the ARPANet, the predecessor to the Internet, and " contributed to a host-to-host protocol " for the ARPANet.

During the Cold War, electromagnetic hearing was clinically studied in the United States for applications including covert message transmission and use as a non-lethal weapon.

During that time he wrote liber amicorum, which is now studied by musicologists.

During his time with Boulanger he studied classical composition including counterpoint which was to play a key role in his later tango compositions.

During the summer semester of 1919, Fromm studied at the University of Heidelberg, where he switched from studying jurisprudence to sociology under Alfred Weber ( brother of the better known sociologist Max Weber ), the psychiatrist-philosopher Karl Jaspers, and Heinrich Rickert.

During his life Ravel studied the ability of each orchestral instrument carefully in order to determine its possible effects while being sensitive to individual color and timbre.