P.S. In no way, shape, or form does the Masons prevent a person from participating fully in the church of their choice, so why would the Catholic Church be afraid of the Masons? The Masons are not a church. A person must seek religious teachings and participation outside the Masons and are expected to do so.
But do you know what they really do?
My great-etc grand-uncle was a Catholic, joined the army of the Potomac as a private, and at some point along the way became a mason, ended the war a shot-up captain.
He died a 33rd degree, estranged from the Church. I imagine the one was related to the other.