The Bohemian Grove Action Network was founded in 1980 in Occidental, California. A prominent member of the group, Mary Moore states that the purpose is “to expose that there is a ruling class in this country, and who they are.” It is hard to determine how many members are in the group but it fits into a larger movement of conspiracy groups that in their most extreme cases work to expose The New World Order, with varying theories on who the New World Order is.
Specifically The Bohemian Grove Action Network protests against the Bohemian Club, which is a yearly meeting of some of the most powerful men in the world in Monte Rio, California. Formed in 1872 the Bohemian Club is an all-male invitation only group that has included every Republican and some Democratic U.S. presidents since 1923, many cabinet officials, directors and CEOs of large corporations including major financial institutions.
Groups like The Bohemian Grove Action Network believe that these meetings are being held to make policy decisions and manipulate world affairs. Moore believes that the Bohemian Club serves as an opportunity for powerful men to make back door deals. More extreme groups see the Bohemians as satanists who rule the world and make human sacrifices. Although many members are powerful people The Bohemian Club seems mostly to function as a vacation retreat for powerful executives with some strange traditions. One such tradition is the Cremation of Care, which involves dark hooded figures paddling boats across a lake and burn effigies in front of a 40-foot owl shrine.
There is really not enough space here to expand on this further, but there are extensive conspiracies developed around the Bohemian Club. I suggest trying the Jon Ronson book “Them: Adventures with Extremists” in which he covers the Bohemian Club in a chapter or this video documentary also made by Ronson: https://www.youtube.com/watch?v=dahQCEzjkfM.