During the 1930s, the ACLU started to engage in work combating police misconduct and Native American rights.

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 1930s other ideas were proposed as non-standard cosmologies to explain Hubble's observations, including the Milne model, the oscillatory Universe ( originally suggested by Friedmann, but advocated by Albert Einstein and Richard Tolman ) and Fritz Zwicky's tired light hypothesis.

During the 1930s, the silent film comedy was replaced by dialogue from film comedians such as the W. C. Fields and the Marx Brothers.

During the 1930s, multiple acts of cannibalism were reported from Ukraine and Russia's Volga, South Siberian and Kuban regions during the Soviet famine of 1932 – 1933.

During the 1930s, the original art for a daily strip could be drawn as large as 25 inches wide by six inches high.

During the 1930s, the original art for a Sunday strip was usually drawn quite large.

During the 1930s and 40s, significant improvements were made to the ground, making it one of the largest in the country at that time.

During the 1930s the French Army experimented with integrating mounted and mechanised cavalry units into larger formations.

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

During the early 1930s throughout Europe, Jewish owners of numerous fine art masterpieces found themselves forced to give up or sell off their collections for minimal prices due to anti-Jewish laws created by the new Nazi regime.

During the late 1920s and early 1930s Eisenhower's career in the post war army stalled somewhat, as military priorities diminished ; many of his friends resigned for high-paying business jobs.

During the 1920s and 1930s destroyers were often deployed to areas of diplomatic tension or humanitarian disaster.

During the Great Depression of the 1930s, John Maynard Keynes authored a book entitled The General Theory of Employment, Interest and Money outlining the key theories of Keynesian economics.

During the 1920s and 1930s, Aimee Semple McPherson was a controversial faith healer of growing popularity during the Great Depression.

During the latter's dictatorship in the 1930s, Guatemala was further opened up to foreign investment, with special favors being made by Ubico to the United Fruit Company in particular.

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 early 1930s, the Vienna Circle dispersed, mainly because of political upheaval and the deaths of Hahn and Schlick.

During the 1920s and the 1930s, Stalin fought and defeated the political influence of Leon Trotsky and of the Trotskyists in Russia, by means of slander, anti-Semitism, programmed censorship, expulsions, exile ( internal and external ), and imprisonment.

Hofmann was renowned not only as an artist but also as a teacher of art, and a modernist theorist both in his native Germany and later in the U. S. During the 1930s in New York and California he introduced modernism and modernist theories to a new generation of American artists.

During the 1930s, the illustrator Vernon Grant developed Snap, Crackle and Pop as gnome-like mascots for the Kellogg Company.

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 Belgian colonial authorities in Rwanda used phrenology to explain the so-called superiority of Tutsis over Hutus.

During the 1930s, the minotaur replaced the harlequin as a common motif in his work.

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 90s, Herman Brood's studio was located on the second floor of the gallery in the Spuistraat in Amsterdam and has remained untouched since his death.

* 1969 – During their honeymoon, John Lennon and Yoko Ono hold their first Bed-In for Peace at the Amsterdam Hilton Hotel ( until March 31 ).

During the Dutch Golden Era, Leiden was the second largest city of Holland, after Amsterdam.

During the next decade, confocal fluorescence microscopy was developed into a fully mature technology, in particular by groups working at the University of Amsterdam and the European Molecular Biology Laboratory ( EMBL ) in Heidelberg and their industry partners.

During Peggy Guggenheim's 30-year residence in Venice, her collection was seen at her home in the Palazzo Venier dei Leoni and at special exhibitions in Amsterdam ( 1950 ), Zurich ( 1951 ), London ( 1964 ), Stockholm ( 1966 ), Copenhagen ( 1966 ), New York ( 1969 ) and Paris ( 1974 ).

During the 17th century many wealthy Amsterdam merchant families built their mansions along the river near Breukelen.

During the 17th century wealthy merchants from Amsterdam would built their estates, such as Huize Akerendam, Huize Westerhout, and Huize Scheijbeeck, in the scenic dunes surrounding Beverwijk.

During the 15th century, a part of the trade route from Amsterdam to Moscow passed through Līva and it was known as the " white road to Lyva portus ".

During the seventeenth century, the Prince Stadtholder as official of the States of Holland clashed several times with the city government of Amsterdam about policy, up to the point that the city was beleaguered by the army.

During a performance of Uncle Tom's Cabin, Amsterdam thwarts an assassination attempt that leaves Bill wounded.

During a knife-throwing act involving Jenny, Bill baits Amsterdam when he throws the knife to leave a superficial cut on her throat.

During " Monk's " funeral, Amsterdam issues a traditional challenge to fight, which Bill accepts.

During his residence in Amsterdam, under Blondel's influence he abandoned Lutheranism and joined the Reformed Church ; and in 1656 he was called by the Elector of Brandenburg to the chair of rhetoric in the University of Duisburg.

During the Second Anglo-Dutch War, on August 27, 1664, New Amsterdam surrendered to English forces.

During that period, the majority of Tegel's regular commercial flights served German domestic routes, hub airports in Frankfurt, London, Paris and Amsterdam, points in the United States and popular holiday resorts in the Mediterranean and Canary Islands.

During the rest of the 1960s he continued to exhibit his work in Kassel, Amsterdam, Duisburg, Darmstadt and Wiesbaden.

During Dutch rule, the Reformed Church was the established church of the colony and was under the authority of the classis of Amsterdam.

During their war against England, the Dutch also occupied New York City, which had formerly been the Dutch settlement of New Amsterdam, but returned it to the English when the English left the war.

During his studies in Amsterdam, Bolkestein was editor for the satirical student magazine Propria Cures.

During the 1998 referendum on the Treaty of Amsterdam it led the No-camp again, unsuccessfully.

During May – June 2012, China Southern Airlines has recruited Dutch flight attendants to serve the First and Business class sections of the Guangzhou to Amsterdam route.

During the rest of the 17th century, the Hudson Valley formed the heart of the New Netherland colony operations, with the New Amsterdam settlement on Manhattan serving as a post for supplies and defense of the upriver operations.

During his tenure in Amsterdam, DNO became renowned for its high-quality ensemble productions and innovative stagings.

During World War II, Deutsche Bank became responsible for managing the Bohemian Union Bank in Prague, with branches in the Protectorate and in Slovakia, the Bankverein in Yugoslavia ( which has now been divided into two financial corporations, one in Serbia and one in Croatia ), the Albert de Barry Bank in Amsterdam, the National Bank of Greece in Athens, the Creditanstalt-Bankverein in Austria and Hungary, the Deutsch-Bulgarische Kreditbank in Bulgaria, and Banca Commercial Romana in Bucharest.