The two enemies of the people are criminals and government, so let us tie the second down with the chains of the Constitution so the second will not become the legalized version of the first.

Not found in any of Thomas Jefferson's writings. This may be a conflation of Jefferson's "chains of the Constitution" comment with Ayn Rand's statement in her essay, Man's Rights: "There are two potential violators of man’s rights: the criminals and the government. The great achievement of the United States was to draw a distinction between these two — by forbidding to the second the legalized version of the activities of the first."