There's a very, very good reason for not wanting to know, and undercover organizations (legal or otherwise) have always exploited it: You can't spill what you

There's a very, very good reason for not wanting to know, and undercover organizations (legal or otherwise) have always exploited it: You can't spill what you don't know. If you're an illegal or espionage group, your members can't be threatened or tortured into giving up information they don't have. Similarly, they can't give it to WikiLeaks.