20 ( c ) A body established by virtue of a bilateral or multilateral agreement. 2. Subject to any authorization, approval and supervision by the public authorities of the States Parties concerned as may be established pursuant to the legislation and practice of those States, agencies, prospective employers or persons acting on their behalf may also be permitted to undertake the said operations. Article 67 1. States Parties concerned shall co-operate as appropriate in the adoption of measures regarding the orderly return of migrant workers and members of their families to the State of origin when they decide to return or their authorization of residence or employment expires or when they are in the State of employment in an irregular situation. 2. Concerning migrant workers and members of their families in a regular situation, States Parties concerned shall co-operate as appropriate, on terms agreed upon by those States, with a view to promoting adequate economic conditions for their resettlement and to facilitating their durable social and cultural reintegration in the State of origin. Article 68 1. States Parties, including States of transit, shall collaborate with a view to preventing and eliminating illegal or clandestine movements and employment of migrant workers in an irregular situation. The measures to be taken to this end within the jurisdiction of each State concerned shall include: (a) Appropriate measures against the dissemination of misleading information relating to emigration and immigration; (b) Measures to detect and eradicate illegal or clandestine movements of migrant workers and members of their families and to impose effective sanctions on persons, groups or entities which organize, operate or assist in organizing or operating such movements; (c) Measures to impose effective sanctions on persons, groups or entities which use violence, threats or intimidation against migrant workers or members of their families in an irregular situation. 2. States of employment shall take all adequate and effective measures to eliminate employment in their territory of migrant workers in an irregular situation, including, whenever appropriate, sanctions on employers of such workers. The rights of migrant workers vis-à-vis their employer arising from employment shall not be impaired by these measures. Article 69 1. States Parties shall, when there are migrant workers and members of their families within their territory in an irregular situation, take appropriate measures to ensure that such a situation does not persist. 2. Whenever States Parties concerned consider the possibility of regularizing the situation of such persons in accordance with applicable national legislation and bilateral or multilateral agreements, appropriate account shall be taken of the circumstances of their entry, the duration of their stay in the States of employment and other relevant considerations, in particular those relating to their family situation. Article 70