Question:
Who was the chair of Communist Party of the Soviet Union in Oct, 1927?

Context:
 Mikhail Gorbachev is the chair of Communist Party of the Soviet Union from Mar, 1985 to Aug, 1991. 
 Konstantin Chernenko is the chair of Communist Party of the Soviet Union from Feb, 1984 to Mar, 1985. 
 Volodymyr Ivashko is the chair of Communist Party of the Soviet Union from Aug, 1991 to Nov, 1991. 
 Leonid Brezhnev is the chair of Communist Party of the Soviet Union from Oct, 1964 to Nov, 1982. 
 Nikita Khrushchev is the chair of Communist Party of the Soviet Union from Sep, 1953 to Oct, 1964. 
 Yuri Andropov is the chair of Communist Party of the Soviet Union from Nov, 1982 to Feb, 1984. 
 Joseph Stalin is the chair of Communist Party of the Soviet Union from Apr, 1922 to Sep, 1953.

Answer:
Joseph Stalin