I had never heard of him, but if you know music of the 60's P F Sloan, a Jewish-Romanian kid from NYC is all over it, songwriter for Johnny Rivers, Jan & Dean, Mamas & Papas, Barry McGuire, Herman's Hermits.
He got out of music shortly after this, reemerging around 2000. Thanks to David Foster to putting me on to this not-very-usual protest song in the comments under "Blood on the Coal."
David also put us on to another one, by the Mitchell Trio, "The Sound of Protest (Has Begun to Pay.)" Anyone want to guess who that is on the left? Granite Dad?