Charlotta Bass and other guests attend a birthday celebration for the Independent Progressive Party of California, circa 1949, Los Angeles

Photograph of Charlotta Bass, second from the right, and other guests listening to an unidentified speaker during a birthday party for the Independent Progressive Party (IPP) of California. Reuben Borough is seated at the far left; Robert W. Kenny, attorney general of California from 1943-47, is seated between Bass and the speaker; the man smoking a cigarette on the far right is attorney Dan Marshall. IPP was formed on June 15, 1948, when the Progressive Citizens of America, Southern California chapter, merged with the Independent Progressive Party of California. The newly merged party supported Henry Wallace's presidential campaign in 1948.

本照片记录了加利福尼亚州独立进步党（Independent Progressive Party, IPP）的生日派对现场：从右数第二位为夏洛塔·巴斯，她与其他宾客正聆听一位身份不明的演讲者发言。鲁本·伯勒坐在最左侧；1943年至1947年任加利福尼亚州总检察长的罗伯特·W·肯尼，坐在巴斯与该演讲者之间；最右侧抽烟的男子为律师丹·马歇尔。加利福尼亚州独立进步党于1948年6月15日由进步公民协会南加州分会与原加利福尼亚州独立进步党合并组建，新合并成立的政党在1948年支持亨利·华莱士的总统竞选活动。