Why are you frightened of them ? Do they cause you physical harm ? How do the illegal immigrants affect you ?
1. Some of them are living in communities that are not transparent and that helps them to commit crimes, in many cases against their compatriots here.
2. there are season criminals among them. They come to steal and return after making a crime. Police fiunds it uneasy to catch them.
3. Although there is a great corruption besides ilegals they manage to corrupt public servants even more. Local authorities and businessmen seem to be interested in foreigners more because they can't use their Human Rights.
But pay attention: I'm not against immigration. I am immigration widening in Russia. The point is that we should use good metodics of immigrants admission.