The fact that the Greater Serbian agitators had been planning to assassinate the heir to the throne for years is best demonstrated by an episode that took place about a year and a half ago in Frankfurt and had its legal repercussions last summer.

The South Slavic students enrolled at the local medical faculty used to meet regularly in a pub in the centre of the city. Among the guests, 20-year-old Vistula Serbanovic from Belgrade claimed to be in favour with the beautiful girls there and to be popular. To make an impression on her, he told her that he belonged to a secret society that had set itself the task of travelling to Vienna and killing the Archduke there.

When the girl asked him, startled, whether he knew for sure about the plan, not only Serbanovic, but also ten of his friends wrote. The house searches that were carried out as a result of the number of enrolled Serbs of the young people involuntarily fished out at the entrance of any anti-partisan protocol had the result that the main participant managed to find a sharply loaded Browning, a Serbian flag and many detonators. During the interrogation, Serbanovic tried to claim that he had only spoken hearsay, but he substantiated it by saying that he had learnt this skill from a good high school student (Tonković or a Serbian commoner).

The Serbanovic trial, which as a minor was only partially investigated later, had little value due to the sensation; it ended with an acquittal because the defence succeeded in proving that the key witnesses were playing a joke that was poorly understood by the students at the time.

Nevertheless, the authorities maintained the view that Serbanovic was not a harmless fantasist after all, but a dangerous agent, and arranged for his expulsion from Austria. The Hungarian authorities did the same.

No one doubts that the young students were really part of a Serbian organisation that planned the murder in Sarajevo. It is also significant that Serbanovic, despite his young age, immediately rejoined a revolutionary organisation that encompassed the entire South Slavic youth.