My grandpa was one. Got an award for it. My denomination does not allow such secret societies. Two of my uncles by marriage were Masons. The Masons meet in my town above what was the old post office.
All that I know. ;)
The Morman wedding ceremony at the temple is a take-off from the masonic initiation ceremony. Ild Joseph Smith got killed when the lical masobs discovered he had broken the vow of secrecy.
Check the video “The Godmakers.”