My understanding is that we have a guest worker program for legally importing farm labor, alongside a "black market" in undocumented labor. Corporate agriculture needs labor and it should be required to go through a legal clearance for criminal record and given at least seasonal documentation along with temporary tax status. Employers bypassing such a clearinghouse should be investigated, prosecuted and fined. Legal status would also give those workers the backing to demand decent wages. Decent wages might even attract some of our own citizens to those jobs.  I think the nuts and bolts are mostly in place, except for a dedicated enforcement agency. Legal or not, those workers are important to our economy. Better if they were legal!