If you ask a Stony Brook University student about activism on campus, they’d likely have little, if anything, to say. To Mitchel Cohen, a student from 1965 to 1975, that reality is hard to swallow. Just half a century ago, Cohen’s days were punctuated with protests on what, according to him, was the most politically active campus on the East Coast. As it turns out, the history of Long Island’s “sleeper campus” is littered with smashed windows, smoke bombs and student arrests.