Did Kerry help hide POW/MIA's still in Vietnam?

From the Villiage Voice:

Senator John Kerry, a decorated battle veteran, was courageous as a navy lieutenant in the Vietnam War. But he was not so courageous more than two decades later, when he covered up voluminous evidence that a significant number of live American prisoners—perhaps hundreds—were never acknowledged or returned after the war-ending treaty was signed in January 1973.

The Massachusetts senator, now seeking the presidency, carried out this subterfuge a little over a decade ago— shredding documents, suppressing testimony, and sanitizing the committee's final report—when he was chairman of the Senate Select Committee on P.O.W./ M.I.A. Affairs.