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 1990s, IBM's influence on PC architecture became increasingly irrelevant.

During its first year, IBM persuaded Taligent to replace its internally developed object-oriented microkernel, called Opus, with the microkernel that IBM was using as the base for IBM's Workplace OS.

During this period, the NUMA technology became the basis for IBM's extended X-Architecture ( eXA, which could also stand for enterprise X-Architecture ).

During 1960s-1970s, several other companies, such as Amdahl, Siemens and Hitachi, had also cloned the IBM architecture without IBM's approval.

During the 1920's the Abstractionists, the German Bauhaus group of industrial designers, and the new architects all had the dream of some well ordered utopia, or welfare state, in which their neat and logical constructions might find their proper place.

During the Western Allied invasion of Germany in April 1945, the airfield was seized by the United States Third Army, and used by the USAAF 354th Fighter Group which flew P-47 Thunderbolts from the aerodrome ( designated ALG R-82 ) from late April until the German capitulation on 7 May 1945.

During World War II, Bonn acquired military significance because of its strategic location on the Rhine River, which formed a natural barrier to easy penetration into the German heartland from the west.

During the Second World War, Bletchley Park was the site of the United Kingdom's main decryption establishment, the Government Code and Cypher School ( GC & CS ), where ciphers and codes of several Axis countries were decrypted, most importantly the ciphers generated by the German Enigma and Lorenz machines.

During the interwar period, aircraft and tank technologies matured and were combined with systematic application of the German tactics of infiltration and bypassing of enemy strong points.

During the Battle of France, the French, who made attempts to re-form defensive lines along rivers, were constantly frustrated when German forces arrived there first and pressed on.

During the Battle of France, the German blitzkrieg-style attack on France went through the Ardennes.

During the Battle of France in 1940, De Gaulle's 4th Armoured Division and elements of the British Expeditionary Force's 1st Army Tank Brigade both made probing attacks on the German flank, actually pushing into the rear of the advancing armoured columns at times.

During the First World War the German army used horses for logistics, 1. 4 million of them, in the 1939 – 45 war it used 2. 7 million horses.

During the German occupation of France he joined the Maquis ( FTP ), a part of the French Resistance.

During European Middle Ages, citizenship was usually associated with cities, see burgher, Grand Burgher ( German Großbürger ) and Bourgeoisie.

During the Battle of the Bulge, however, the fuses became known as the American artillery's " Christmas present " for the German army because of their effectiveness against German personnel in the open, when they frequently dispersed attacks.

During this time he also lost the potential advantage of the larger guns on his ships: they could commence firing at a longer range than the German ships.

During the 19th and early 20th century, many smaller or less developed languages saw their first encyclopedias, using French, German, and English role models.

During the First World War, German troops retreated into this territory from Kamerun because Spain was neutral during the war.

During the run-up to the German general election in 2005, which was held ahead of schedule, Stoiber created controversy through a campaign speech held in the beginning of August 2005 in the federal state of Baden-Württemberg.

During World War I, the German sabotage of the Black Tom Wharf ammunition depot damaged buildings on Ellis Island.

During and immediately following World War II Ellis Island was used to intern German merchant mariners and enemy aliens-American civilians or immigrants detained for fear of spying, sabotage, etc.

During the Siege of Paris in 1871, the North German Confederation, supported by its allies from southern Germany, formed the German Empire with the proclamation of the Prussian king Wilhelm I as German Emperor in the Hall of Mirrors at the Palace of Versailles, to the humiliation of the French, who ceased to resist only days later.

During the invasion of Poland and the Battle of France, Luftwaffe fighters — primarily the Messerschmitt Bf 109 — held air superiority, and the Luftwaffe played a major role in German victories in these campaigns.

During the 1960s and 1970s German mathematician Heinrich Heesch developed methods of using computers to search for a proof.

During these operations the Crown Prince won the reputation of a thorough soldier ; after peace was made and Saxony had entered the North German Confederation, he gained the command of the Saxon army, which had now become the XII army corps of the North German army, and in this position carried out the necessary re-organisation.