Galt's Gulch is a fictional place, founded by John Galt, where the best and brightest exited the parasitic status quo of legalized plinder by the State to establish a truly free society bases on private property.
It's from Ayn Rand, _Atlas Shrugged_. The best and brightest, the freedom-loving, were the "Atlas" who shrugged.
"Who is John Galt?"