leave the United States on account of any activities performed by him in his official capacity. In case of abuse of such privileges of residence by any such person in activities in the United States outside his official capacity, it is understood that the privileges referred to in Section 11 shall not be construed to grant him exemption from the laws and regulations of the United States regarding the continued residence of aliens, provided that:
(1) No proceedings shall be instituted under such laws or regulations to require any such person to leave the United States except with the prior approval of the Secretary of State of the United States. Such approval shall be given only after consultation with the appropriate Member in the case of a representative of a Member (or a member of his family) or with the Secretary-General or the principal executive officer of the appropriate specialized agency in the case of any other person referred to in Section 11;
(2) A representative of the Member concerned, the Secretary-General or the principal Executive Officer of the appropriate specialized agency, as the case may be, shall have the right to appear in any such proceedings on behalf of the person against whom they are instituted;
(3) Persons who are entitled to diplomatic privileges and immunities under Section 15 or under the General Convention shall not be required to leave the United States otherwise than in accordance with the customary procedure applicable to diplomatic envoys accredited to the United States.
(c) This section does not prevent the requirement of reasonable evidence to establish that persons claiming the rights granted by Section 11 come within the classes described in that section, or the reasonable application of quarantine and health regulations.
(d) Except as provided above in this section and in the General Convention, the United States retains full control and authority over the entry of persons or property into the territory of the United States and the conditions under which persons may remain or reside there.
(e) The Secretary-General shall, at the request of the appropriate American authorities, enter into discussions with such authorities, with a view to making arrangements for registering the arrival and departure of persons who have been granted visas valid only for transit to and from the headquarters district and sojourn therein and in its immediate vicinity.
(f) The United Nations shall, subject to the foregoing provisions of this section, have the exclusive right to authorize or prohibit entry of persons and property into the headquarters district and to pre-
