"An Oakland, California Grocery store bears a "Sold" sign as well as one proclaiming the patriotism of its owner. The Japanese American shopowner, a University of California graduate, hung the "I am an American" sign the day after the attack on Pearl Harbor. Soon afterward, the government shut down the shop and relocated the owner to an internment camp, along with thousands of other Pacific Coaast Japanese Americans." See here for source.

Unfortunately, even some of my libertarian friends have been persuaded by Michelle Malkin's case in favor of the Japanese internment. For a good summary of holes in her arguments, see Jonathan Dresner at Cliopatria.