How do you define an "enemy of the constitution" and an "enemy of liberty". Sounds fairly subjective to me or have you taken a course?
Like everything else, sometimes it is black and white, and sometimes there are shades of grey. Why a course? What the Hell would a single course teach you about such a subject? Do you not sometimes know when you see an enemy? Do you not know, for an example, that the leadership of China is opposed to liberty, or that the legal counsel for Bill Clinton is opposed to the US Constitution? Some things can be known in life - it would be terrible to think you are not allowed to make a judgment call on anything. Actually, nobody in the world and nobody in history has ever really been a relativist - it's impossible.
So, let me just phrase my comment slightly differently, to aid understanding: If I know a person is an enemy of the Constitution, by their words or actions, they are an enemy of mine, because the US Constitution is the just Law of the Land of the nation I love and of which I am a citizen. Bill Clinton, and all of his supporters who are not physically, mentally retarded, are therefore my enemies. Bill Clinton happens to be my enemy for more personal reasons, too, but that's an only slightly related matter.