Hahm was born in Dresden in 1890, where she still ran a mail order bookstore in 1920. In the first half of the 1920s she came to Berlin, where she started working as a lesbian activist in 1926. Of particular importance for the city's lesbian scene was her founding of the "
Damenklub Violetta", which was one of the largest lesbian clubs in the city with up to about 400 participants. The club was associated with the
Deutscher Freundschaftsverband (DFV), one of the major homosexual organisations of the time. In 1929 Hahm's club Violetta united with Käthe Reinhardt's club "Monbijou", a similar sized lesbian club. In the course of this Hahm and Reinhardt changed to a larger competing organization, the
Bund für Menschenrecht. The merger of the two big clubs and the change caused a great stir in the lesbian scene of the time; in the DFV and its magazine
Frauenliebe there was talk of betrayal and intrigue. As justification Hahm wrote that it would have been considered "grotesque" that "a heterosexual man should be the leader of homosexual women" and on the other hand due to financial irregularities of Bergmann. She summed up that "the time has finally come for Karl Bergmann, who founded the Monbijou Women's Club only to exploit it for his personal purposes, to disappear." Advertising photos of Hahm show her in a casual position wearing men's clothes. Although she was suspected of holding a so-called transvestite license, she was assumed to identify as a woman. Together with
Felix Abraham, in 1929 Hahm was involved in the foundation of the first German organisation for transgender people, the transvestite association D'Eon, which still existed in 1932. D'Eon was open to people assigned male and female at birth alike, was based at the
Institute for Sexology of
Magnus Hirschfeld and was directed by Hahm until 1930. Hahm was also involved in the organization of lesbian groups, for example, she had been the leader of the women's group of the BfM since 1928 and in 1930 she called – unsuccessfully – for the foundation of a Germany-wide "federation for ideal women's friendship". == Nazi era ==