The linked post below is 95% factual (a few acerbic asides never hurt a grounded argument) and followed, in the comments, by a list of linked sources.
By the way, here is the American Heritage Dictionary definition of “concentration camp”: “A camp where persons are confined, usually without hearings and typically under harsh conditions, often as a result of their membership in a group the government has identified as dangerous or undesirable.” Clearly, this definition–like all similar definitions in all dictionaries–applies to the camps in question.
To our shame, these camps are being used as profit centers for high-dollar investors. We shouldn’t be surprised, though. It happened during WWII when Japanese-Americans were shipped from California to various concentration camps, freeing up their property to be sold off for a few pennies on the dollar.