Reactivating suspended Facebook account

I am posting on behalf of a Hungarian activist friend who got locked out of his Facebook account a week ago. He tried every available means to regain access — to no avail. He runs a page with tens of thousands of followers supporting teachers who are striking against low wages and unjustified retributions across Hungary. He is worried that the Hungarian government might have requested pressured Facebook to suspend his account.

Can anyone help? How can you get in touch with the relevant people?