Associated Press (AP) — Delicate negotiations between the United States and Russia led to basketball star Brittney Griner's return Friday in exchange for notorious arms dealer Viktor Bout, once nicknamed “the Merchant of Death.” It's the latest in a series of high-profile prisoner swaps involving Americans detained abroad. Here is a look at some of the most notable exchanges. ___ FRANCIS GARY POWERS, 1962 Perhaps the most famous one came at the height of the Cold War when Powers, a high-altitude U-2 spy plane pilot who was shot down over the Soviet Union in 1960, was exchanged on a German bridge for Russian spy Col. Rudolph Abel.