Kupala's writing changed to an optimistic tone following the Great October Revolution of 1917. Among Kupala's numerous translations into the Belarusian language were the internationalist-Marxist anthem "The Internationale" and an ancient epic poem The Tale of Igor's Campaign (translated in 1921). Nevertheless, Kupala maintained his connections with the anti-Soviet oriented nationalist emigres of the Belarusian People's Republic, who exhorted that he join them in exile in Czechoslovakia during a trip abroad in 1927. At home, the newly established authorities considered him with some distrust–at times, criticism of Kupala in the press mounted insofar as his activities were regarded as too oriented around nationalism. This period stopped once he printed a public letter of apology in the 1930s.