A Manhattan Supreme Court judge has levied a $317,000 sanction against a law firm and two of its partners in a matrimonial case, saying they made “misrepresentations and knowingly false statements to the court.”

Justice Ellen Gesmer, ruling in the five-year-long case of L.G. v. M.G., 310479/10, said Abe Konstam and Madeline Nisonoff, partners at Mallow, Konstam, Mazur, Bocketti & Nisonoff, had prolonged the litigation by bringing frivolous motions and directing their clients not to comply with a subpoena.