Order under the Act to be binding on sub-tenants.

Any order for the eviction of a tenant passed under this Act shall be binding on all sub-tenants under such tenant, whether they were parties to the proceedings or not; provided that such order was not obtained by fraud or collusion. In cases where sub-letting is allowed under the original agreement of tenancy the sub-tenant shall be made a party to the proceedings if he had given notice of the sub-tenancy to the landlord.