A shadowy world government. Political kingmakers. A capitalist cabal looking to impose its will across the globe. For decades, conspiracy theorists have tried to decode the secretive Bilderberg Group, an annual gathering of the some of the world's most powerful figures. Since 1954, the Bilderberg Group has been gathering in secret to discuss everything from the rise and fall of communism to nuclear warfare to cybersecurity. The group began as a way to create more cooperation between Europe and North America during the Cold War, and Bilderberg releases an annual list of the people who will attend and the topics they'll discuss, but beyond that, little leaves the walls of the meeting rooms. Theorists also cite the inclusion of Bill Clinton at the meetings in 1991 before he was president and Tony Blair's presence in 1993 before he became the British prime minister as examples of the group's power. Past attendees have included former Secretary of State Henry Kissinger (who will also be attending this year), former Chase Manhattan chief executive David Rockefeller, and British Prime Minister David Cameron. Two-thirds of this year's attendees are from Europe while a third are from the U.S., including Sam Altman, president of the tech seed accelerator Y Combinator; NBC News's Richard Engel; Sen. Lindsay Graham of South Carolina; LinkedIn CEO Reid Hoffman; and PayPal co-founder Peter Thiel.