When Beogradski Sportski Klub (BSK) was founded in 1911, the club which dominated the fields of the Kingdom of Serbs, Croats and Slovenes developed a significant fan base.

Throughout the several wars that took place since the founding of BSK, the club's turbulent history (which is corresponding with the volatile history of the Balkans overall) has produced adverse effects onto the average attendance of today's matches in which OFK Beograd plays.

The fans' love towards the club was certainly not forgotten and in 1994 a new group is founded – Plava Unija Beograd.

Plava Unija fostered a friendship with Voždovac's fans, "Invalidi" while the club still played in Yugoslavia's second tier from 1996 to 1998.

[1] They Plava Unija express their love for their city, club and country with many creative activities.