gerard t. ouimette , 75 , known as ` the frenchman , ' died in medium security federal pen in his sleep .
former mob enforcer had ties to new england crime boss raymond l.s. patriarca and was suspected of a role in as many as eight murders .
even behind bars , police say ouimette kept his influence - accepting a weekly delivery of as much as $ 600 worth of booze and food to his cell .