Almost a third of the founding cast of Saturday Night Live, including Dan Aykroyd, John Belushi, Gilda Radner, and Bill Murray, came from the Second City comedy troupe. From 1981-1984, three quarters of the cast of SNL came from Chicago, with about half from The Second City and a quarter from Practical Theatre Company (including Julia Louis-Dreyfus).
The Second City comedy troupe has been around for a long time -- since 1959 -- and many of America's greats started out there, including Chris Farley, Tina Fey, Mike Meyers, and Jim Belushi. And from Toronto, the Canadian home of the Second City, Gilda Radner, Eugene Levy, and Martin Short.
About a third of the current SNL cast came out of the Second City, and Beck Bennet, from the north side, is one of SNL's "current features".