Hypothetical question: A member reports some major abuse going on the forum by another member and starts receiving threats on his personal contact details. Will the forum protect the first member in this case ?
How could the forum admins protect you from this kind of harassment?
You said you would be receiving threats on your personal contact details, not here on the forum.
Depending on the level of those threats you should inform the ones responsible for the way you are reeving them (email provider, fb, twitter, chat app etc) or go next level and report it to the authorities. Not that is going to solve anything.
Besides, 99% of those that are threatening people here are keyboard warriors.