http://en.wikipedia.org/wiki/Joseph_N._Welch
[McCarthy is dragging yet another random name from the List, when Head Counsel for the Army Joseph Welch responds.]
"Until this moment, Senator, I think I have never really gauged your cruelty or your recklessness. Fred Fisher is a young man who went to the Harvard Law School and came into my firm and is starting what looks to be a brilliant career with us. Little did I dream you could be so reckless and so cruel as to do an injury to that lad. It is true that he will continue to be with Hale and Dorr. It is, I regret to say, equally true that I fear he shall always bear a scar needlessly inflicted by you. If it were in my power to forgive you for your reckless cruelty I would do so. I like to think that I am a gentle man but your forgiveness will have to come from someone other than me. "
When McCarthy tried to go on the attack once more, Welch stepped in again and famously rebuked:
" Senator, may we not drop this? We know he belonged to the Lawyers Guild. Let us not assassinate this lad further, Senator. You've done enough. Have you no sense of decency, sir? At long last, have you left no sense of decency?"
McCarthy had none. Apparently, neither do you.