Violence against atheists?

I am just curious about this because I don't hear about it. I hear about Atheists being shunned and hated but not that much about any actual physical harm outside of intense mental/emotional harm. This question is only intended in the U.S. I know it happens in other countries. I am just wondering if Atheists need to fear this in the same manner as a homosexual would fear beatings and being killed?

I moved this question here due to a lack of interest where it was.