[6] When he was seventeen years old, Gaćinović was a member of the literary society which served as a front for "Matica", and published a critically noted essay about the raconteur Petar Kočić.

[7] "Gaćinović's friends and followers were mostly like him — quiet, young, undernourished, intense, swinging furiously between moods of sentimentality and ruthless revolutionary aggression.

When Franz Joseph I of Austria visited Bosnia and Herzegovina on 3 June 1910, Žerajić had intended to attempt his assassination during his passage through Mostar, but eventually gave up his plan for unknown reasons.

[15] In his late teens, after visiting the Kingdom of Serbia, Gaćinović organized underground cells, kruzoks, amongst Serbs in Bosnia and Herzegovina, Zagreb, and western Slavonia.

Titled "Cry of a Desperate One" (Serbian: Крик очајника), it attacked the younger generations, in particular students at foreign universities, for lack of idealism and opportunism, petty individualism, and conformity.