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www.freedomofmind.com]
They started in London, as a spin off from an Ouspensky study group. The London group is called School of Economic Science.
They have advertisements for philosophy classes, but what is covertly taught is derived from bogus Gurdjieff and Ouspensky material.
You can be involved for years and get sucked in gradually before you really know what is going on.
Strict old fashioned dress code. The guys wear suits, and women have to wear skirts--very big on proper gender roles.
They have a school for children in New York that apparently has a good reputation, and in both the US and UK, they market themselves to the upper classes.
Someone in the UK wrote a book, The Secret Cult about this group.
Do a search both on Google and the Google groups and you'll find plenty more.