SAM disappeared at MIT due to reasons specific to the chapter; it got overrun with non-frat members living there, and various other weirdness in the 1970s, and the house voted to leave the fraternity, then become an MIT co-ed independent living group, Fenway House. It sort of became the GLBT place at some point too, and was generally both small (15-30 students) and weird.

I lived there as an undergrad in the 1990s. The most famous alum is probably Lori Berenson, who was held by the Peruvian government for years for (maybe inadvertently) supporting a terrorist organization.