The aim of the presented paper is to show the history of the development of research on social minorities in the environment of Bialystok sociologists. This research center, located on the north-eastern borderland of Poland, was one of the first in Poland to develop research in the field of borderland sociology. With time, the research subject has been expanded, from the analysis of the assimilation of the Belarusian minority to the contemporary face of the idea of a multicultural society, discussing not only nationality, religiosity, but also non-heteronormities.