"Professionals" would seem to be the word to fill in the blank in your sentence.
The mandate specifically lists professions that have frequent contact or interaction with children, such as the professions or fields that you listed in the statement: Medical workers, social workers, teachers or other school officials, law enforcement officers. To that list you could also add childcare providers, and therapists or counselors. Some states also would require workers and even volunteers in programs that provide organized activities for children, such as camps or recreation centers.
In the treaty, Russia ceded hegemony over the Baltic states to Germany; they were meant to become German vassal states under German princelings. Russia also ceded its province of Kars Oblast in the South Caucasus to the Ottoman Empire and recognized the independence of Ukraine.
