Dudan is directly linked to his "national border". He participated in the
March on Rome, representing the Italian fascists of Zadar and Dalmatia. As Consul of the Militia, he was elected to the
Chamber of Deputies for the first time in 1921 from Rome, and again in 1924 and 1929 as an at-large delegate. Dudan was a
Freemason, probably from his time in
Vienna. In 1918, he was the master of the "Universe" gallery in Rome. During the meeting of the
Grand Council of Fascism on 23 February 1923, he was among those who abstained from voting, believing in the incompatibility of Fascism and Masonry. Due to this, he was ejected from the Grand Lodge of Italy. On 1 March 1934, he was appointed a senator of the Kingdom and was sworn in on 4 May that year. In his parliamentary work, he always reminded representatives not to forget Dalmatia. At the outbreak of
World War II, Dudan managed to finally achieve his dream: annexation of much of Dalmatia and the creation of the Governorship of Dalmatia. However, in 1944 Dudan was arrested and imprisoned in Padula and remitted to the High Court of Justice for Sanctions against Fascism. His senatorship was revoked on 28 December 1944. ==Last years and death==