14th Amendment, Section 3, should be enough to remove a swath of swamp critters from office:

No person shall be a Senator or Representative in Congress, …who, having previously taken an oath …to support the Constitution of the United States, shall have engaged in insurrection or rebellion against the same, or given aid or comfort to the enemies thereof. But Congress may, by a vote of two-thirds of each House, remove such disability.

Full public declas and disclosure, arrest en masse, and dare the remaining critters to override with 2/3 vote of both houses.