Note: This paragraph is from a Wikipedia page about the Santo Tomas Internment Camp in the Philippines. It is important that you read this paragraph before reading this book.
As for the subtitle of this book; "FDR's Secret Prisoner Exchange"; Towards the end of the war and right after, some of the Internees were repatriated back to their homelands at the invitation of our government. But others, like Kolb, were sent whether they wanted to go or not.
The ones selected had all failed the test of democracy. Kuhn had even tried to blackmail Helena Rubinstein in 1939, just 3 years after giving Hitler that check. His ruse with Ms. Rubinstein was that she was to give him $5000,000 or her sister in Poland would be killed by the Nazi's. He was the leader of the American Bund at the time. He was arrested later for other crimes. He, along with other undesirables, was traded for American fighting men and barred from returning to the United States. Although the author may be troubled by this, I have no problem with it, whatsoever.
Note: For a far more sympathetic picture of the Japanese Internment question, you could do no better than to see the film "Bad Day at Black Rock" with Spencer Tracy. Although it is fiction, it makes the same point as the author is trying to impart; in a far more sympathetic way.