[3] During World War II, Petric was a "Rosie the Riveter", building Liberty ships in New Jersey.
[4] In 1962, Petric became the head of the San Francisco Folk Music Club and began hosting the popular jam sessions in Haight-Ashbury.
She retired from her job at the California State Department of Rehabilitation in 1970, after her daughter finished college, to focus on music full-time.
The group traveled around North America in an old school bus performing at numerous folk festivals.
[3] Petric was involved with Spanish Civil War refugees, anti-fascism committees, worked for racial equality, and was a political target during the McCarthy Era.
[7] Friends of Petric have described her as the "Fort Knox of folk music," for her ability to recall the lyrics of thousands of songs.