The New York mob boss often called "the last don" was convicted yesterday in a federal racketeering case that centered on charges that his bloody 25 years as the dominant power in the Bonanno crime family included seven murders and a host of other crimes. The conviction of the boss, Joseph C. Massino, 61, on all 11 counts followed a startling trial that included damaging testimony from his own brother-in-law and underboss and an unusual claim by the defense lawyer that if Mr. Massino was a crime boss, he was a peaceful one opposed to rubouts. The verdict was a...