Another Wikipedia article to check out is http://en.wikipedia.org/wiki/McCarran_Internal_Security_Act#... . The provisions of that act are more-or-less the same thing - a reversal of the idea of habeas corpus. It grants the executive branch power to indefinitely detain masses of political dissenters without trial. The provision that allows this was proposed by the champion of US liberalism at the time, Hubert Humphrey.
That 1950 list is the 1982 list and is also the current list. Of course the names change as times go by, but the purpose is the same. For the government it is a good idea - it worked pretty well for Germany and Italy - you get rid of troublesome nationalities and political dissenters. It works well and makes a lot of sense for them. Of course I myself don't condone it.