The court's job, not the jury's, is to determine what laws apply. Violating the jury oath may subject you to prosecution for perjury. An unrepentant nullifier should be excused for cause on counsel's or the court's own motion. If others on the panel have possibly been infected by the disclosure, they should be interviewed individually, outside the presence of other panelists. How to address distributing leaflets in and around the courthouse presents a potential minefield.
Restraint is advisable, as it is less likely to dignify or emphasize the message of the nullifiers.
Some help may be found in cases cited by the government in Regas, above, although Mrs. Regas's plea bargain prevented a definitive ruling addressing First Amendment rights vs. the court's right to an untainted jury pool. Until a precedent is set, read the Grace decision narrowly. Consider first using prophylactic instructions pointing out to your jury panels that freedom of speech in this country is so broad that it tolerates courthouse distribution of brochures full of wrong notions and beliefs about the law. Most jurors will listen to your admonitions, and those who disagree will probably be flushed out during your expanded voir dire . If your whole jury panel seems infected, consider restrictions on the nullification activists.