During the Battle of the Bulge, quite a few Germans, speaking fluent English and wearing U.S. uniforms, went behind America lines to spread false information and to sabotage materiel and communications. When they were suspected, they were held until the nearest captain or lieutenant could be rustled up, and given a few minutes to try to sell him their lie. When he didn't buy it, these war criminals were stood up against the nearest wall and shot--and this was completely legitimate under the laws of war. The Army even filmed some of these executions to document them.
What kind of true patriot are you, I wonder?