A whistle-blower is someone who sees illegal activity and wants to make sure that it is dealt with. A leaker takes something that's a secret and releases it.
I mean, right now, if you're watching what's going on in the United States, a President of the United States has been indicted for taking secrets away from secret facilities. At least in his case, he keeps it in his bathroom.
In the case of the leaker, he took it out into the public. That's illegal. I mean, imagine if—