sentences:  The KMPX staff began picketing outside the station's offices, and were soon supported in their efforts by popular bands such as the Grateful Dead and Blue Cheer, as well as the station's devoted listeners.The staff at KPPC walked out the next day.Crosby refused to cave in to his striking staff, and brought in his own replacements, who were forced to cross angry picket lines, to continue the progressive rock format at both stations.