First held in the titular Netherlands hotel in 1954, ostensibly to foster better relations between Europe and North America, Bilderberg has been an annual, travelling summer affair in the six decades since. The fact that it brings together (on invitation only) some of the most powerful political and financial leaders on the planet for a spot of behind-closed-doors hobnobbing and potential global policy discussion has been raising concerns since it properly entered the public consciousness around the turn of the century.
http://www.newstalk.com/bilderberg-history