<p>John G. Adams, a key figure in the proceedings that effectively ended Sen. Joseph McCarthy's career, passed quietly from the scene last week at age 91. Not surprisingly, his death made no news; it's been a while since those heady days when McCarthy launched his investigations of the Army, which had, he charged, been shielding countless Communist agents at Fort Monmouth and elsewhere. It fell to Adams, the Army's chief counsel, to deal with the charges, which he did to devastating effect in the Army-McCarthy hearings that held the nation in thrall in the 1950s.</p>