The Christian Science Monitor has this article titled How judges cope with everyday threats on the job.
The magnitude of this problem struck me a few months back when one of the local judges who is about my age told me a story that freaks me out completely, and so of course I insisted that it be retold the next time after that when we were again in a tale-telling mode.
When I was a law clerk, it was about the time of the letter bomb that killed an appeals court judge in the 11th Circuit (as I recall). So, we got a memo from the Administrative Office of the United States Courts, and it read like a script from the Road Runner cartoon - don't open a mysterious package if it has exposed wires or is ticking or says Acme Bomb Company on the return address. (OK, I made that last part up.)
Soon after we got the memo, the computers showed up.
"I'm not opening it," I said. "You open it."