For the purpose of assisting in such production of agricultural commodities and products as the Secretary of Agriculture deems necessary. by supplying agricultural workers from the Republic of Mexico (pursuant to arrangements between the United States and the Republic of Mexico). the Secretary of Labor is authorizedThat law then spells out the general terms and conditions under which an international labor agreement can be negotiated and carried out with Mexico. Public Law 78 does not expire until December 31. 1955. But the migrant labor agreements last but a year at a time. The last one expired on January 1. 1954. It was extended to January 15 by mutual agreement while negotiations for a new agreement were going on.