Born into wealth, she disapproved of high society, and became involved in philanthropic work, helping to launch the Swiss Communist Party and one of the first birth control clinics in Zürich.

Her father, had made a fortune creating an inexpensive watch of good quality for sale in the Russian market before opening a second successful factory in Switzerland.

[6] After Heinrich's death, in 1887 Fanny bought a large chateau near Au and entertained lavishly,[7] putting the care of her children in the hands of a nursemaid.

[1] During 1888 and 1889 the family traveled through various spa towns like Badenweiler, Karlsruhe, Vienna and Wiesbaden, while the castle was being renovated and her mother was being treated by Freud.

[8] They also wintered at places like Abbazia on the coasts of the Adriatic Sea, but Moser found the frivolous lifestyle tedious and became convinced her mother's problems were caused by her lack of social service.

[11] Struck by the conditions of the poor living in Southwark, she became involved in the settlement movement and learned of a two-year course being offered to teach social work at the Women's Colleges of the University of Cambridge.

She also began publishing, with such works as Contributions to the Charity and Social Assistance in Their Practical Application[14] Feminine Youth of the Upper Classes: Considerations and Recommendations.

In January 1909, Moser and Balsinger married and within the year, gave birth to the couple's first child, a daughter they named Amrey, on 24 December.

[16] In 1913, Moser's son became seriously ill with tuberculosis of the spine, causing the couple stress, but her husband, who had successfully planned a food cooperative was deemed essential to the country and spared war service.

[21] Though she became head of the communist women's group, after Rosa Bloch-Bollag died,[22] Moser's authoritative manner brought conflict and her political radicalism put her job at Pro Juventute at risk.

In 1926, accepting a position as a writer for the Swiss Communist Party newspaper, she took Edouard with her and moved to Moscow, reporting on hospitals, worker cooperatives and conferences.

[24] Returning to Switzerland the following year, she made plans to build an international children's home in Moscow and relocate permanently to Berlin.

Gathering medical supplies and materials, with the help of Fritz Platten, she made plans to build the children's home in the suburb of Waskino (Vas'kino).

She used her contacts to secure participation by such artists as the singer Ernst Busch, the composer Hanns Eisler, and the poet Erich Weinert.

[27] Moser was virtually penniless and began writing, publishing numerous articles in the communist newspaper Basler Vorwärts.

In 1957, Otto Grotewohl, first prime minister of the GDR awarded Moser the Clara Zetkin Medal[29] and in 1959, she was honored with the Patriotic Order of Merit.