Colonial officials believed that many crypto-Jews were going to Mexico during the 16th century and complained in written documents to Spain that Spanish society in Mexico would become significantly Jewish. Officials found and condemned clandestine synagogues in Mexico City. At this point, colonial administrators instituted the Law of the Pure Blood, which prohibited migration to Mexico for New Christians (Cristiano Nuevo), i.e. anyone who could not prove to be Old Christians for at least the last three generations. In addition, the administration initiated the Mexican Inquisition to ensure the Catholic orthodoxy of all migrants to Mexico. The Mexico Inquisition was also deployed in the traditional manner to ensure orthodoxy of converted indigenous peoples. The first victims of burnings (or "autos de fé") of the Mexican Inquisition were indigenous converts convicted of heresy or crypto-Jews convicted of relapsing into their ancestral faith.