Can I report people for hacking my friend's Myspace?

I know that hacking is actually illegal. Is there a way to report the people that have hacked into my friend’s Myspace account? I don’t know their last names, only first (and I’m not sure whether he would tell me because although he does want them out of his life, I don’t know that he’d want them to get arrested or anything, but this is illegal, so they should!), but I do know where both of their Myspace pages are, and the AIM and MSN screennames of one (they were stupid enough to let me know all of that and to admit to the hacking too, lol), and I know that one lives fairly close to me and the other is currently in another state. Is this enough info to go on to report someone?

And with him not here to accuse them himself, would it do any good?