The text of Bureaucrat reads:
Gain a Silver card, put it on top of your deck. Each other player reveals a Victory card and puts it on top of his deck. (or reveals a hand with no Victory cards).
When I play the card and a player does not have any victory cards in their hand, it instructs you to reveal a hand with none. Should they only reveal their hand to me or are they required to reveal their hand to the entire group of players?