The current wave of social clubs isn't the first time youth groups have swarmed Disneyland and made others uncomfortable. In the late 1960s, Disneyland dealt with hippies and anarchists, most infamously in the 1970 Yippie invasion of Disneyland, which saw hundreds of "long hairs" conquer Tom Sawyer Island, block major thoroughfares, get into fights with security and police, and force an early, unexpected closure—one of only two times Disneyland has officially closed early for a non-private event.