Jensen by - an oral agreement rented an apartment by the month from Oakes at 3605 Broadway' in Louisville. Effective July 1, 1947, under the Federal Rent Control Act, 50 U.S.C.A.Appendix, § 1881 et seq., landlords were authorized to increase rentals by 15%, provided tenants agreed to the raise.'- Jensen did not agree to this increase and on July 25 Oakes mailed him a registered letter demanding the premises upon three grounds: (1) Jensen was violating the rental agreement; (2) he was refusing to give the landlord free access to the apartment to collect the rent and for the purpose of inspecting the premises; (3) Jensen was abusive and threatened the landlord without just provocation. A fourth ground, not contained in’the letter, was that the neighbors were complaining of Jensen. Similár letters were written by Oakes to the other tenants in the building.