The The Stonecutters reference article from the English Wikipedia on 24-Apr-2004
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The Stonecutters

The Ancient Society of Stonecutters is a fictional secret society from the animated television show The Simpsons conceived as a parody of Freemasonry in particular and secret societies in general. Founded on extreme secrecy, its members include various Springfield residents--such as Montgomery Burns and Carl Carlson--who enjoy special privileges, such as free soda and vibrating chairs. Meeting every Wednesday at a giant pyramid-shaped building, they play homage to their Sacred Parchment, then get drunk and play ping-pong. The Stonecutters are numbered according to rank, their leader being Number One (voiced by Patrick Stewart).