He was active in relocating disadvantaged children from Istria and Bosnia and Herzegovina to more fertile areas, largely in Slavonia and Podravina.

In 1919, Basariček began his involvement in the colonization of Slavonia from areas such Gorski kotar and Lika, and continued with this cause until his death.

[citation needed] From the founding of the Croatian Peasant Party, Basariček collaborated with its leader Stjepan Radić.

Believing as Radić did that the Croats needed to embrace Pan-Slavism, Basariček learned Czech and Russian.

In 1927 he addressed the assembly saying that "dark powers" were preparing a dictatorship which was "equally dangerous to the Croats and to Serbdom".