Oltramare spent four years as a member of the Federal Assembly of Switzerland representing the National Union.
In the ensuing trouble, recruits of the Swiss army opened fire on the left demonstrators resulting in 13 deaths.
[5] The National Union was the Swiss political movement most closely associated with Italian fascism.
[2] In 1939, Oltramare left the party's leadership and was then excluded in 1940 by the new collective direction.
After that he moved to Italy and then to German-occupied Paris in order to co-operate more closely with the Nazis.