In 1954 the broadcast by a group of marijuana reform advocates extolling the pleasures of cannabis resulted in the tape being impounded by the California Attorney General.
Ten years later, the show – now known by the shorter title Hearts of Space – was syndicated in the U.S. to NPR stations, while remaining at its first home at KPFA.
Originally hosted by Don Joyce of Negativland, it is the longest-running block of free-form audio collage in radio history.
[8] KPFA is also known for Puzzling Evidence, the longest running radio program of the Church of the Subgenius hosted by Doug Wellman and Harry S. Robins.
The staff claimed that Pacifica Radio had been making network more corporate, softening its voice of dissent, and attempting to get rid of some of the volunteers at the station.
[23] KPFA's sister stations are WBAI New York, KPFT Houston, KPFK Los Angeles, and WPFW Washington.
In the Bay Area, Comcast carries KPFA's broadcasts on cable channel 967, as part of its digital radio offering.