Are police allowed to disclose to anyone anything in particular a victim or criminal has disclosed?

Not anything... it all depends. There is a freedom of information act which allows somethings to be available to the public. Criminal history and other personal information is not as easily available as say a police report.
Your question is confusing. Please provide more information, and maybe an example.

If someone has assaulted you, and you are under the age of 18, then yes, the police can tell your parents...and the police SHOULD tell your parents.
If still under investigation? Not a great idea.
uh,.you ever heard of the miranda warning? that is presicely what it states.
Only if the cop is trying to help the person and hates the other. That would fall into the personal discretion category.
That's the cool thing about being the police.
it depends
They can but usually don't because doing so may comprimise their investigation(s) or undermine a prosecution. They also try (but not too hard) to respect the victim's privacy.
Police do it all the time. For instance, if they are questioning the husband about the fact that he hit his wife, they will say, 'Your wife says that you hit her.' That is a disclosure of the what the victim said to the defendant.

The Police will use information against known criminals to trick them. They will say that they have witnesses that saw a particular person do something. The reality is that they may or may not have a witness at all.

If you are accused of any wrongdoing, it is not wise or prudent to talk to the Police without counsel. The Police will tell you that they are trying to help you out, be your pal. In reality, they are gathering information that may be used to file charges against you.

Good Luck

Jim


Answers:
Policemen are not supposed to tell what they know about investigations.