] Hundreds, perhaps thousands of lives could have been
] saved had the United States government taken action to
] rescue people claiming American citizenship. Often it did
] just the opposite, creating obstacles that impeded
] Americans from obtaining the necessary documents to
] escape from the Nazis.

] In 1939, more than 80,000 American citizens were believed
] to be living abroad. State Department officials held that
] citizens who had no apparent intention of returning to
] the United States could not expect their government to
] feel any obligation to protect them. An even deeper
] prejudice lay behind this viewpoint: the belief that
] citizens returning from abroad would become "welfare"
] cases.

] In fact, officials planned to decide whom they wanted to
] allow to return to the United States. The official
] responsible for helping U.S. citizens overseas,
] Breckinridge Long, said in June 1942 that Americans in
] Germany awaiting repatriation "ought to be examined and
] only those we want should be accepted"

I ran across this article while doing some research. This is the first time I've heard anything about known U.S. citizens being in concentration camps.

U.S. Policy Toward Americans in Peril