Article 13
Except in so far as in any particular case any privilege or immunity is waived by the Secretary-General acting on behalf of the Organisation, all officers who are permanent members of the staff of the Organisation shall enjoy:—
(a)
Immunity from suit and legal process in respect of words spoken or written and of acts done by them in their official capacity and within the limits of their authority;
(b)
Exemption from income tax in respect of emoluments received by them as officers of the Organisation.