Former aides get immunity in probation probe

To testify against ex-commissioner in corruption case

Two former top aides to John J. O’Brien when he was probation commissioner have been granted immunity from prosecution in ­exchange for testifying against him in federal and state corruption inves­tigations, a state prosecutor disclosed in court on Tuesday.

Prosecutors for Attorney General Martha Coakley confirmed Tuesday that Edward P. Ryan, who was O’Brien’s legislative liaison, as well as former deputy commissioner Francis M. Wall, are cooperating with the prosecutors. The two men can give prosecutors a firsthand view of the way O’Brien allegedly funneled jobs and promotions to polit­ically connected job candidates.

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