This has been an issue with some men who think that they can be both Mason's and Catholics. Then Cardinal Ratzinger, reaffirms that Catholics cannot be Mason's. There are numerous members of the KofC that are Mason's (I know its unimaginable!) There is even a whole local parish that is a safe haven for Mason's and the Council of said parish is engulfed with Mason's. Say it aint so! I wish I could!
John Salza, a Catholic and former Mason explains why Catholics cannot be Masons. Worth watching them all.