I seem to remember a line from some guy named Ben...something about how you shouldn't trade bits of freedom for temporary safety...
In all seriousness, however, this is a clear-cut, black-and-white violation. You don't get to pass ex post facto laws to punish a group--ANY group--of current 'political undesirables' past their current sentence. You don't get to say, "Oh, they're dangerous, so it's okay if we jail them permanently." This country, and the Constitution that binds it, expressly forbids this type of horseshit because it sets a horrific precedent.
Fear will always be exploited by people to restrict American rights and ideals--we've seen it as far back as the Alien and Sedition Acts, we continue to see it in Guantanamo Bay and its ilk. If this continues to stand, I have no doubt that it will be used as precedent in some future case against other 'undesirables'. I abhor what they've done, but this is WRONG.