The Billboard Liberation Front is a group of pranksters devoted to "improving" billboards by changing key words to radically alter the message, often to a liberal anti-corporate message. They published an instructional pamphlet titled "The Art & Science of Billboard Improvement."
The BLF came out of an event of the San Francisco Suicide Club. After the untimely death of its founder Gary Warne, the remaining members of the group formed the San Francisco Cacophony Society, which went on to spawn a variety of
culture jamming events (e.g. the BLF) and other groups (burning man, Santa Anarchy, etc.).
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