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"On August 6, 1970, Disneyland abruptly shut down about five hours early. Around 30,000 visitors were kicked out of the park, and it wasn’t due to a national crisis. The motivating factor was a group of about 300 young “Yippies,” who entered the park with grand plans of capturing Tom Sawyer Island, liberating Minnie Mouse, and cooking Porky Pig (who is not even a Disney character)."

http://www.atlasobscura.com/articles/disneyland-yippies-1970