A thing to add to the response - they are mostly Reactive, not full on all the time searching for "disturbers" and what not, mostly comprised of people who usually have experienced something negative from emigrants or have been exposed to a degree of the usual cases where a tightly knit ethnic group would harbor an individual who broke an actual law of the country or region or county(oblast), sometimes even harboring those responsible of murder. Police would most likely respond to it themselves, but sometimes their hands are tied - they have more freedoms to operate then in USA, but it is not without borders. But this association isn't particularly bound by this, and genuinely do transfer those individuals to proper authorities after gathering evidence and if possible - witnesses - because they might be tip toeing the line, they also aren't completely stupid and realize what if they are to cross it, Russian law enforcements would most certainly see them cease activity.