Whoever, by threats or force, willfully prevents, obstructs, impedes, or interferes with, or willfully attempts to prevent, obstruct, impede, or interfere with, the due exercise of rights or the performance of duties under any order, judgment, or decree of a court of the United States, shall be fined under this title or imprisoned not more than one year, or both. No injunctive or other civil relief against the conduct made criminal by this section shall be denied on the ground that such conduct is a crime.