New York Magazine did an awesome oral history of UCB:
It was the winter of 1999, and Amy Poehler was in a grimy bathroom on West 22nd Street, pulling used condoms out of a toilet. For three years, the 28-year-old Poehler and her fellow members of the Upright Citizens Brigade comedy troupe—Matt Besser, Matt Walsh, and Ian Roberts—had been performing sketch and improv anywhere they could. Now, thanks to Rudy Giuliani’s anti-porn crusade, they had their own theater in a defunct strip club. “The women’s locker room was all Prince mix tapes and bikinis,” Poehler remembers. “It was as if there’d been a nuclear disaster and everyone had just turned into dust and left all their shit behind.”