The passive Croatian vocabulary contained many banished words equivalent to the actively used words of the politically approved vocabulary. For example, the officers of the JNA could be publicly called only "oficir", and not "časnik". For the usage of word "časnik" ('officer'), coined by a father of Croatian scientific terminology Bogoslav Šulek, the physician Ivan Šreter was sentenced to 50 days in jail in 1987. Concordantly, the possibility of using the previously frequent word "časnik" was already reduced to the extent that before 1991 it could occur only in special contexts, e.g. in relation to historical events.