Laws on books about communists in the U.S.?
Citizens' arrests needed?
50 U.S. Code § 842 - Proscription of Communist Party, its successors, and subsidiary organizations
The Communist Party of the United States, or any successors of such party regardless of the assumed name, whose object or purpose is to overthrow the Government of the United States, or the government of any State, Territory, District, or possession thereof, or the government of any political subdivision therein by force and violence, are not entitled to any of the rights, privileges, and immunities attendant upon legal bodies created under the jurisdiction of the laws of the United States or any political subdivision thereof; and whatever rights, privileges, and immunities which have heretofore been granted to said party or any subsidiary organization by reason of the laws of the United States or any political subdivision thereof, are terminated: Provided, however, That nothing in this section shall be construed as amending the Internal Security Act of 1950, as amended [50 U.S.C. 781 et seq.]
(Aug. 24, 1954, ch. 886, § 3, 68 Stat. 776.)
https://www.law.cornell.edu/uscode/text/50/842
The Communist Control Act of 1954 (68 Stat. 775, 50 U.S.C. 841-844) is an American law signed by President Dwight Eisenhower on 24 August 1954 that outlaws the Communist Party of the United States and criminalizes membership in or support for the party or "Communist-action" organizations and defines evidence to be considered by a jury in determining participation in the activities, planning, actions, objectives, or purposes of such organizations
https://en.wikipedia.org/wiki/Communist_Control_Act_of_1954