In the area around Zagreb, Croatia, the brothers worked the territory systematically, yet in a way to avoid detection. One strategy was to call at every tenth house. For example, if assigned to work the first house, the publishers would visit houses 1, 11, 21, 31, and so on. Through those efforts, many came to know about Jehovah. Given the challenges that the door-to-door ministry presented, however, informal witnessing proved to be the preaching method most often used.

Veronika Babić was born in Croatia, and her family began to study in the mid-1950’s. After her baptism in 1957, she moved with her husband to Sarajevo, Bosnia. Milica Radišić, from the Slavonia region of Croatia, was baptized in 1950. Her family also moved to Bosnia.