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Leonid Gaidai is a Soviet film director and screenwriter, best known for his comedies, which have been popular in the Soviet Union and Eastern Europe since the 1960s. His films are often satirical and feature slapstick humour, and they often poke fun at Soviet society and bureaucracy. Some of Gaidai's most famous films include Operation Y and Shurik's Other Adventures, Ivan Vasilyevich Changes His Profession, and The Diamond Arm.