There was no crusading journalist, no nonprofit group taking up his cause, just Inmate 95A2646, a high-school dropout from Brooklyn, alone in a computerless prison law library. Jabbar Collins pried documents from wary prosecutors, tracked down reluctant witnesses and persuaded them, at least once through trickery, to reveal what allegedly went on before and at the trial where he was convicted of the high-profile 1994 murder of Rabbi Abraham Pollack.