Sa Kolubarom je sarađivalo oko 100 vlasnika mašina, uključujući i snahu gradonačelnika Jagodine Dragana "Palme" Markovića, predsjednika Ujedinjene srpske partije u vladajućoj koaliciji.
About 100 machine owners worked with Kolubara, including the daughter-in-law of Jagodina Mayor Dragan "Palma" Markovic, president of the United Serbia Party in the ruling government coalition.