Serbianization

Serbianisation or Serbification or Serbisation (Serbian: србизација/srbizacija or посрбљавање/posrbljavanje; Bulgarian: сърбизация, sərbizacija or посръбчване, posrəbčvane; Romanian: serbificarea) is the spread of Serbian culture, people, or politics, either by integration or assimilation.

We find here, as everywhere else, the ordinary measures of "Serbization" — the closing of schools, disarmament, invitations to schoolmasters to become Servian officials, nomination of "Serbomanes," "Grecomanes," and vlachs, as village headmen, orders to the clergy of obedience to the Servian Archbishop, acts of violence against influential individuals, prohibition of transit, multiplication of requisitions, forged signatures to declarations and patriotic telegrams, the organization of special bands, military executions in the villages and so forth.

Immediately after annexation of Vardar Macedonia to the Kingdom of Serbia, the Macedonian Slavs were faced with the policy of forced serbianisation. Those who declare as the Bulgarians were, harassed or deported to Bulgaria. Many high clergy of Bulgarian Orthodox Church were expelled: Cosmas of Debar (Bishop), Axentius of Bitola (Archbishop), Neophytus of Skopje, Meletius of Veles, Boris of Ohrid and others. The population of Macedonia was forced to declare as Serbs. Those who refused were beaten and tortured. prominent people and teachers from Skopje who refused to declare as Serbs were deported to Bulgaria. International Commission concluded that the Serbian state started in Macedonia wide sociological experiment of "assimilation through terror."

...
Wikipedia