What do you think about me telling my friend who was falsely accused of sexual assault at work to not contact my contacts without asking me first
If your friend is innocent, why don't you want him contacting your contacts?
I'm not dis-informing anyone about this. He's a respectable person.
Office slander should be taken seriously. Protecting your friend from the ridicule of others is admirable and shows how much you care about them. Your friend will know who to trust in the future and looking out for them will improve your friendship.
I still should be the one to decide who to inform about these things.
It's great to protect people and stand up for others that are falsely accused. Just be sure that your intentions are good when you do so.