[1] Rupert Berger attended the secondary school in Traunstein and was a founding member of the Bavarian People's Party.
During the First World War he was a soldier in the Imperial Navy.
He was head of the Bayernwacht in the Chiemgau and was briefly interned in the Dachau concentration camp in 1933 and then released without notice.
After his release, Berger worked as an innkeeper in Regensburg and Landshut.
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