Some Portuguese "conversos" or "cristãos-novos" continued to practice as crypto-Jews. In the early 20th century, historian Samuel Schwartz wrote about crypto-Jewish communities discovered in northeastern Portugal (namely, Belmonte, Bragança, Miranda, and Chaves). He claimed that members had managed to survive more than four centuries without being fully assimilated into the Old Christian population. The last remaining crypto-Jewish community in Belmonte officially returned to Judaism in the 1970s and opened a synagogue in 1996. In 2003, the American Sephardi Federation founded the Belmonte Project to raise funds to acquire Judaic educational material and services for the Belmonte community, who then numbered 160–180.