Activists and foreign actors have infiltrated the city’s public schools with anti-Israel materials, fostering bias and hatred of Jews, according to a new report by a nonprofit think tank.Teacher groups like NYC Educators for Palestine have collaborated with extremist organizations, some allegedly tied to hostile foreign governments and terrorist groups, to bring “radical, anti-American ideologies” into schools, said the Network Contagion Research Institute, or NCRI, and the advocacy group New York City Public School Alliance, which co-wrote the report.