In my book, although this will offend a lot of people here, I would say FDR. If you think the way the Bush administration rounded up Arabs is bad, then look into the Japanese internment. I would personally recomend the book Judgement Without Trial by Tetsuden Kashima. Also the book (now with a foward by Mr. Kashima) which is the government report gives a very accurate and detailed history of what the Japanese went through as well as what happened to the Aleuts (most people don't even know that they were also put into "camps"). Also, if you read Alan Lomax's The Land Where the Blues Began, where exactly is the new deal in the black south?
Anyways, I personally am not of fan G.W.B. I don't agree with many things. But take a look at history and see what others have been through. Times HAVE been worse.