The national guard was ordered to confiscate legally owned weapons in the aftermath of hurricane Katrina (under Republican President Bush). They also "quartered" themselves in a privately owned church without permission or payment (a more obscure amendment, to be sure).
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Some refused to carry out this blatantly unconstitutional order.
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Government's fear of guns in the hands of We the People isn't limited to liberals. All politicians in power ultimately want to remain in power, and guns in the hands of the People is the greatest real threat, aside from the vote, that they face. This is why the second amendment is so powerful.
The Jose Guerena situation is very saddening, not only because a patriot lost his life, but because this is not an isolated incident in this country.