Answer by taking a quote from the following article:

Screeching Weasel is an American punk rock band originally from the Chicago suburb of Prospect Heights, Illinois. The band was formed in 1986 by Ben Weasel and John Jughead. Since their formation, Screeching Weasel have broken up and reformed numerous times with numerous line-up changes. Ben Weasel has been the only constant member, though Jughead was present in every incarnation of the band until 2009.

The band originally called themselves All Night Garage Sale but changed their name to Screeching Weasel, a variation of a name a friend had suggested, Screaming Otter, which was a reference to a T-shirt that read, "I'VE GOT A SCREAMING OTTER IN MY PANTS!". Shortly after their formation, Weasel decided that it was too difficult to play bass and sing at the same time, so Vince Vogel, who took the stage name "Vinnie Bovine" joined as the band's bassist. The band recorded their debut album, Screeching Weasel, in one night for $200 and released it on Chicago label Underdog Records in 1987.  In 1988, Bovine was fired from the band and was replaced with Warren Fischer, better known as Fish, and former member of the band Ozzfish. The band recorded their second studio album, Boogadaboogadaboogada!, which featured Weasel playing second guitar (he would later state that he only played on about a quarter of the songs) and made a name for themselves by opening a show for Operation Ivy at 924 Gilman Street. Steve Cheese was fired from the band shortly after the recording due to his unwillingness to tour outside of Chicago. He was replaced by Aaron Cometbus for two shows who then was replaced by Brian Vermin. Boogadaboogadaboogada! was released in late 1988 on Roadkill Records, a label formed by investor David Best and managed by Ben Weasel following an introduction of the two by producer Mass Giorgini.  After what Weasel described as a "disastrous" tour, Fish left the group and was replaced by Dan Schafer, originally nicknamed "Sewercap" and later renamed Danny Vapid. The new band members recorded an extended play entitled Punkhouse for Limited Potential Records soon after that. The band ended up recording four more songs in 1989 that were featured on compilations, featuring a second guitarist Doug Ward, who also joined the band for several live performances. Screeching Weasel disbanded when Vermin and Vapid stated that they wanted to leave the band to concentrate on their side project, Sludgeworth.

Did anyone else leave?
Steve Cheese was fired from the band shortly after the recording due to his unwillingness to tour outside of Chicago.