Early years of the communist government is an exceptional period in the history of Polish migrations. We can observe then some of the largest migrations in Polish history - mainly forced - as well as the rise of restrictions to international mobility to an unprecedented level. This article focuses on the first decade of the communist party rule and the transition period between the 'black decade' of large scale forced migrations (1939-1949) and the time of 'Polish closure', that is the period of deep sovietization of the 50s. At that time institutional features of restrictions of mobility were laid - in the form of passport and border control. The author points to a contradiction between the modernist character of the communist project and the repression of international mobility which is after all one of the main features and factors of modernity. After the period of the 'black decade' of forced displacements, communist Poland appears to be a country of new 'attachment to land' rather than a country of forced migrations. Despite the subsequent erosion of mobility restrictions, the scale of suppressed migrations seems to be much larger than migrations due to the authority pressures.