Who gets to determine who is disloyal and who is patriotic and supporting the Constitution and Founding Father's intent? Think anyone out there would consider us "disloyal" to "the cause" on the topics of, oh, I don't know... Gay rights / gay marriage; gun control; illegal immigration; right to life; etc?
Internment camps are an extremely bad idea and would set a horrific precedent that we (as a people) would no doubt regret.