Eminenti Apostolatus Specula
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In eminenti apostolatus specula was a Papal Bull issued by Pope Clement XII on 28 April 1738, banning Catholics from becoming Freemasons.
He noted that membership of Masonic Lodges was open to men of any religion or sect but had already been forbidden by several governments which considered it a threat to their own security. All Catholic participation in Masonry was prohibited as it was under suspicion of heresy, partly because of its already notorious secrecy.
See also Catholicism and Freemasonry