Supposedly there is a constitutional right to petition (First Amendment). Supposedly any prior restraint on expression comes to the Court with a “heavy presumption” against its constitutional validity. [Carroll v. Princess Anne, 393 U.S. 175, 181 (1968); Bantam Books, Inc. v. Sullivan, 372 U.S. 58, 70 (1963)]
However, it's all bullshit. The law is whatever a judge says. My litigation against my ex-wife / business partner is domestic violence "abuse", regardless of whether the cases have merit or not.