In the early 1990s, Kerry headed a Senate committee that was supposed to determine whatever became of American troops in the Vietnam War whose whereabouts were not recorded. Under his leadership, the panel concluded there was “no evidence” that any Americans left behind in Vietnam were still alive. Shortly after Kerry declared to the world, “President Bush should reward Vietnam within a month for its increased cooperation in accounting for American MIAs.” Hanoi then announced that it had awarded a fat contract to Boston real estate firm Colliers International, then headed by the senator’s cousin Stuart Forbes. Colliers International was...