He was the Minister of Interior between 1919-1921 in the early governments headed by Kārlis Ulmanis during the Latvian War of Independence. As the leader of his party, Bergs was elected to the Constitutional Assembly of Latvia, 1st Saeima, 2nd Saeima and 3rd Saeima, but no longer took part in governments. During 1921-1934 he published and edited newspaper Latvis ("Latvian") which represented center-right, Latvian nationalist opinions of well-off city dwellers. According to the Jewish Daily Bulletin, he was already known as an anti-semite in the 1920s.