According to Tadeusz Swietochowski, in 1930s, the term was used to describe the official policy pursued by Reza Shah Pahlavi to assimilate the ethnic minorities in Iran (Iranians as well as Non-Iranians). In particular, within this policy the Azerbaijani language was banned for use on the premises of schools, in theatrical performances, religious ceremonies and in the publication of books. Swietochowski writes: