The San Francisco Bay Area is known for a lot of things. Berkley and its university - today known for being a center of campus communism - was once a center for science and innovation, contributing to the Manhattan Project and nuclear research after the war. The hippy movement originated here and Santa Clara Valley got the informal name "Silicon Valley" during the technological boom in the 1970s. Today, it is one of the most politically correct areas on the planet.
Even here, subversion lurks just below the surface, in the form of Thrash Metal. With a culture focused on conforming and censoring the world's problems away, the Metal scene focused on lyrical themes of violence, warfare, tyranny and rebellion, with even faster tempo and harsher lyrics than traditional Thrash Metal. This distinct style has become known as Bay Area Thrash Metal.