Question: John Belushi met Dan Aykroyd while working at what Comedy club best known as the first ever on-going improvisational theater troupe based in Chicago.
Related documents: [0]  [DOC] The Second City is an improvisational comedy enterprise, best known as the first ever on-going improvisational theater troupe based in Chicago. It also has programs that run out of Toronto and Los Angeles. The Second City Theatre opened on December 16, 1959, and has since become one of the most influential and prolific comedy theatres in the world. [END] 
[1]  [DOC] John Adam Belushi ( ; January 24, 1949 – March 5, 1982) was an American comedian, actor and musician. Belushi is best known for his "intense energy and raucous attitude" which he displayed as one of the seven original cast members of the NBC sketch comedy show "Saturday Night Live" ("SNL"). Throughout his career, Belushi had a close personal and artistic partnership with his fellow "SNL" star Dan Aykroyd, whom he met while they were both working at Chicago's The Second City comedy club. [END] 
Answer: 
The Second City
The Second City