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He was elected to the Federal Council of Switzerland on 11 December 1919 and handed over office on 30 April 1934. He was affiliated with the Christian Democratic People's Party of Switzerland.
Musy was acquainted with Himmler. Toward the end of World War II, the Germans were retreating and near defeat. At the request of two Swiss Orthodox Jews, Recha Sternbuch and her husband Yitzchak Sternbuch, and in coordination with them, Musy and his son Benoît Nicolas Musy engaged in high level negotiations with the Nazis to rescue large numbers of Jews in the concentration camps. Musy was involved in the release of 1,210 prisoners from the Theresienstadt concentration camp. The group was saved after $1.25 million was placed in Swiss banks by Jewish organizations working in Switzerland. However, the money was never paid to the Nazis. Holocaust Rescue Mission in 1944 
Another son, Pierre, received numerous equestrian competition titles and won the four-man bobsleigh gold medal at the 1936 Winter Olympics in Garmisch-Partenkirchen, Germany. Pierre Musy biography 
- Kranzler, David. Three who tried to stop the Holocaust (article).
- Kranzler, David; Friedson, Joseph. Heroine of Rescue: The Incredible Story of Recha Sternbuch Who Saved Thousands from the Holocaust. Artscroll History Series, Mesorah Publications Ltd. ISBN 978-0-89906-460-4.
- Moriah Films, Unlikely Heroes, documentary, includes chapter on Recha Sternbuch (USA)
- Jean-Marie Musy biography in English 
- Jean-Marie Musy biographie en français 
- Profile of Jean-Marie Musy with election results on the website of the Swiss Federal Council.
- Daniel Sebastiani: Jean-Marie Musy in German, French and Italian in the online Historical Dictionary of Switzerland, 2007-11-30.
|Member of the Swiss Federal Council
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