Hat tip to Rollo Tomassi at The Rational Male ( http://therationalmale.com/ ):
"A heckler once interrupted Nikita Khrushchev [the then-dictator of the Soviet Union] in the middle of a speech in which he was denouncing the crimes of Stalin [the brutal previous dictator]. 'You were a colleague of Stalin's,' the heckler yelled, 'why didn't you stop him then?' Khrushchev apparently could not see the heckler and barked out, 'Who said that?' No hand went up. No one moved a muscle. After a few seconds of tense silence, Khrushchev finally said in a quiet voice, 'Now you know why I didn't stop him.'"