The indictment against underworld bosses Krassimir and Nikolay Marinovi - dubbed the Marguins and their five accomplices was filed at Sofia City Court on Thursday.
The investigation materials were collected in 17 volumes.
The two Marguins, brothers Ivo and Svetlin Karageorgievi and Vesselin Toshev are charged with plotting three murders and arms possession. Former Foreign Minister General Lyubomir Gotsev, Todorov- Doktora, killed in Sofia in February, and the businessman Nikola Damyanov are said to have been the targets of the murders masterminded by the two notorious brothers.