Following the elections, allegations of electoral fraud emerged. An investigation by the Law School of the Pontifical Catholic University of Chile, led by Jaime del Valle and presented by
Canal 13 on the evening of 17 July, established the existence of alleged electoral fraud estimated at approximately 200,000 votes, based on supposed false registrations and manipulation of records. The director of the Electoral Registry,
Andrés Rillón, dismissed the accusations, stating that the complaint itself did not prove the existence of fraud. At the same time, the director of the Civil Registry and Identification Service, Heriberto Benquis, ruled out the alleged fraudulent registration of citizens. The pro-government press reported that Jaime del Valle had manipulated the identification data of some of the voters presented in the investigation, replacing digits in their ID numbers. The allegations were examined by an Investigative Commission in the Chamber of Deputies, which was established on 24 July but ceased its operations when Congress was dissolved after the
11 September coup d'état. During a session of the Commission for the Study of the New Constitution, it established the practical ineffectiveness of the electoral records and the need of purification. Consequently, the registers were declared void by Decree Law No. 130 on 19 November 1973 and destroyed on 6 July 1974. In October 1986, with the Chilean
Electoral Service replacing the former Electoral Registry Directorate, new voter registries were opened. ==Results==