An estimated 15,000 teachers, parents, and other supporters encircle City Hall in New York during a mass rally in support of an ongoing teachers' strike in 1968. AP As argument commenced at the Supreme Court last Monday, most eyes were on Justice Antonin Scalia. While still the Court’s conservative paterfamilias, union supporters were looking to Scalia as a potential swing vote in their favor in the case, Friedrichs v.