The party began to experience ideological divisions among its followers as it entered the 1970s. In 1970, member Frank Collin, who was himself secretly the son of a Jewish father, broke away from the group and founded the National Socialist Party of America in Chicago, which became famous for its attempt to march through Skokie, Illinois, which was home to many Holocaust survivors. This led to the United States Supreme Court case, National Socialist Party of America v. Village of Skokie. Other dissatisfied members of the NSWPP chose to support William Luther Pierce, and formed the National Alliance in 1974.