[1][2] Although he is known for his work in the early Yugoslav communist organization "Napred," Delić is mostly recognized for being the mayor with the shortest term in the history of Zagreb.

[2] Upon becoming a resident of Zagreb in 1910, Delić, together with Josip Cimermančić, became involved in the work of the recently formed communist organization, "Napred," becoming one of its first 50 members.

[3] Delić rose to a high-ranking position in the organization, becoming heavily involved in its marketing in the Zagreb newspapers Novosti [hr] and Sloboda to attract new members.

Two weeks later, in early April, Delić gave a speech directed against the opponents of communism, accusing them of restricting the freedoms of the general population.

[6] The ruling Serbian Karađorđević dynasty perceived rising communism and the elections of numerous communist mayors such as Delić all over the country as a threat to the monarchy and ordered measures to be taken to prevent them from gaining influence in politics.

At 9 a.m. on 18 April, Delić received a phone call from the ban's advisor Dragutin Tončić, relieving him of his duty and disbanding the city council.

The meeting was held under a siege by gendarmerie and army troops surrounding the building, as Delić locked himself and 27 present councilmen inside, trying to perform mayoral duties while under suspension.

The quorum was confirmed to be met and the minutes were signed, but nothing else could have been accomplished before officer Vragović and his 30 men broke into the city hall and arrested Delić and all attending councilmen.