My knowledge base in this area is on the low side of the scale - but the following made me think of their connection to blm/antifa.

U.S. Constitution Annotated Article II. EXECUTIVE DEPARTMENT Section II Clause II THE EXECUTIVE ESTABLISHMENT Appointments and Congressional Regulation of Offices The Loyalty Issue.

By section 9A of the Hatch Act of 1939, a federal employee was disqualified from accepting or holding any position in the Federal Government or the District of Columbia if he belonged to an organization that he knew advocated the overthrow of our constitutional form of government. The 79th Congress followed up this provision with a rider to its appropriation acts forbidding the use of any appropriated funds to pay the salary of any person who advocated, or belonged to an organization which advocated the overthrow of the government by force, or of any person who engaged in a strike or who belonged to an organization which asserted the right to strike against the government. These provisos ultimately wound up in permanent law requiring all government employees to take oaths disclaiming either disloyalty or strikes as a device for dealing with the government as an employer.

If you haven’t already... here’s top level you can bookmark: https://www.law.cornell.edu/constitution-conan