Question: When did the Soviet Union seal off the city where the director of The Man from Morocco was born?

full_context: Document 1: The Man Between: The Man Between (also known as Berlin Story) is a 1953 British thriller film directed by Carol Reed and starring James Mason, Claire Bloom, Hildegard Knef and Geoffrey Toone. The screenplay concerns a British woman on a visit to post-war Berlin, who is caught up in an espionage ring smuggling secrets into and out of the Eastern Bloc.
Document 2: Berlin Wall: The Berlin Wall (German: Berliner Mauer, pronounced (bɛʁˈliːnɐ ˈmaʊ̯ɐ) (listen)) was a guarded concrete barrier that physically and ideologically divided Berlin from 1961 to 1989. Constructed by the German Democratic Republic (GDR, East Germany), starting on 13 August 1961, the Wall cut off (by land) West Berlin from virtually all of surrounding East Germany and East Berlin until government officials opened it in November 1989. Its demolition officially began on 13 June 1990 and finished in 1992. The barrier included guard towers placed along large concrete walls, accompanied by a wide area (later known as the ``death strip '') that contained anti-vehicle trenches,`` fakir beds'' and other defenses. The Eastern Bloc portrayed the Wall as protecting its population from fascist elements conspiring to prevent the ``will of the people ''in building a socialist state in East Germany.
Document 3: Max Ehrlich: Max Michaelis Ehrlich (7 December 1892, Berlin – 1 October 1944, Auschwitz concentration camp) was a German actor, screenwriter, and director on the German theater, comedy and cabaret scene of the 1930s.
Document 4: West Berlin: West Berlin was 100 miles (161 kilometres) east and north of the Inner German border and only accessible by land from West Germany by narrow rail and highway corridors. It consisted of the American, British, and French occupation sectors established in 1945. It was, however, a de facto part of West Germany. It had a special and unique legal status because its administration was formally conducted by the Western Allies. At the same time, East Berlin, de jure occupied and administered by the Soviet Union, was the de facto capital of East Germany. The Berlin Wall, built in 1961, physically separated West Berlin from its East Berlin and East German surroundings until it fell in 1989.
Document 5: The Man from Morocco: The Man from Morocco is a 1945 action adventure film directed by Mutz Greenbaum as Max Greene. The film was produced by Welwyn Studios in Great Britain.
Document 6: Maxime Alexandre: Maxime Alexandre (February 4, 1971 in Ronse, East Flanders, Belgium) is a Belgian cinematographer, with a career focused mostly on horror movies.
Document 7: Guido Seeber: Guido Seeber (22 June 1879 in Chemnitz – 2 July 1940 in Berlin) was a German cinematographer and pioneer of early cinema.
Document 8: Spectre (2015 film): After wrapping up in England, production travelled to Morocco in June, with filming taking place in Oujda, Tangier and Erfoud, after preliminary work was completed by the production's second unit. An explosion filmed in Morocco holds a Guinness World Record for the "Largest film stunt explosion" in cinematic history, with the record credited to production designer Chris Corbould. Principal photography concluded on 5 July 2015. A wrap-up party for Spectre was held in commemoration before entering post-production. Filming took 128 days.
Document 9: The Adventures of Tartu: The Adventures of Tartu (alternate British title and American release title: Sabotage Agent, aka Tartu), is a 1943 British Second World War spy film starring Robert Donat. It was a morale booster of the era portraying Nazis as highly corruptible due to their desire to seduce women and to gain personal advancement.
Document 10: History of Germany (1945–1990): The intended governing body of Germany was called the Allied Control Council. The commanders - in - chief exercised supreme authority in their respective zones and acted in concert on questions affecting the whole country. Berlin, which lay in the Soviet (eastern) sector, was also divided into four sectors with the Western sectors later becoming West Berlin and the Soviet sector becoming East Berlin, capital of East Germany.
Document 11: Mutz Greenbaum: Mutz Greenbaum (3 February 1896 – 5 July 1968), sometimes credited as Max Greene or Max Greenbaum, was a Berlin, Germany-born film cinematographer.
Document 12: Berlin Wall: The Berlin Wall (German: Berliner Mauer) was a guarded concrete barrier that physically and ideologically divided Berlin from 1961 to 1989. Constructed by the German Democratic Republic (GDR, East Germany), starting on 13 August 1961, the Wall completely cut off (by land) West Berlin from surrounding East Germany and from East Berlin until government officials opened it in November 1989. Its demolition officially began on 13 June 1990 and finished in 1992. The barrier included guard towers placed along large concrete walls, accompanied by a wide area (later known as the ``death strip '') that contained anti-vehicle trenches,`` fakir beds'' and other defenses. The Eastern Bloc portrayed the Wall as protecting its population from fascist elements conspiring to prevent the ``will of the people ''in building a socialist state in East Germany. In practice, the Wall served to prevent the massive emigration and defection that had marked East Germany and the communist Eastern Bloc during the post-World War II period.
Document 13: Germany: After Germany surrendered, the Allies partitioned Berlin and Germany's remaining territory into four military occupation zones. The western sectors, controlled by France, the United Kingdom, and the United States, were merged on 23 May 1949 to form the Federal Republic of Germany (Bundesrepublik Deutschland); on 7 October 1949, the Soviet Zone became the German Democratic Republic (Deutsche Demokratische Republik). They were informally known as West Germany and East Germany. East Germany selected East Berlin as its capital, while West Germany chose Bonn as a provisional capital, to emphasize its stance that the two - state solution was an artificial and temporary status quo.
Document 14: Max Taut: Max Taut was born in Königsberg, the younger brother of Bruno Taut. He, his brother and Franz Hoffman formed Taut & Hoffman, an architecture firm in Berlin, In the 1920s, Max Taut was particularly known for his office buildings for trade unions. Between 1922 and 1925, he built one house a year on Hiddensee island, each one very different from the others.
Document 15: Our Man in Jamaica: Our Man in Jamaica/Operation Jamaica () is an 1965 Italian Spanish German international co-production Eurospy adventure film directed by an uncredited Mel Welles. It was credited to for reasons of European funding.
ground_truth: 1961
sub_queries: The Man from Morocco >> director Answer: Mutz Greenbaum
What is the place of birth of Mutz Greenbaum ? Answer: Berlin
when the soviet union sealed off the city of Berlin Answer: 1961