inform on somebody
inform against somebody

It has nothing to do with being informed on anything.

I am sure we are much better informed on this matter now.

She would be the only one not to inform on the others.

I am completely informed on the history of the situation.

I have been informed of an attack tonight on your base.

It is high time the public was better informed on this matter.

We'll keep you well informed on anything that turns up.

For one thing, he said, it's important to stay informed on current events.

"We keep him fully informed on all major national issues."

We would like to be kept informed by the Committee on a regular basis.