Charles Murr says Interpol confirmed Bugnini was a Freemason. No such evidence has been published

Neither the documents Murr describes nor any report of an Interpol check has been made public. InfoVaticana’s own article notes that Bugnini “always denied any link with Freemasonry” and, in his memoirs of the reform, blamed his fall on an anonymous dossier brought to the Pope. It adds that Archbishop Gagnon’s report on the Curia “was handed to three Popes and has never been published” (InfoVaticana).

Bugnini became secretary of the Congregation for Divine Worship in May 1969 and was appointed Apostolic Pro-Nuncio to Iran on 4 January 1976 (Catholic-Hierarchy). His post ended when Paul VI merged the Congregations for Divine Worship and for the Sacraments by the apostolic constitution Constans nobis of 11 July 1975 (vatican.va). The merged body was named the Congregation for the Sacraments and Divine Worship; Murr’s name for it is the later one.

The 1917 Code of Canon Law, in force in the 1970s, named Masonic associations expressly (as the 1983 declaration below recalls) and attached excommunication to joining them (can. 2335). The 1983 Code no longer names them, but the Congregation for the Doctrine of the Faith declared that year that “the Church’s negative judgment in regard to Masonic association remains unchanged”, that “membership in them remains forbidden”, and that Catholics who enrol “are in a state of grave sin and may not receive Holy Communion” (CDF, 26 November 1983).