Despite the name "Mason" implying an absolute confirmation that the members are not Mafia-aligned, some moderators have been known to put Mafia members into a masonry
anyway, with the role only implying a high confidence in the alignment of the masonry members (more than with a
Neighbour). It may be worth asking the moderator how absolute the confirmation provided by a masonry is meant to be. (In an extreme case, if the game is advertised as
bastard mod, the odds of scum in the masonry is probably rather higher than 50:50!)