The Association of Farmworker Opportunity Programs
www.afoprograms.org/
http://www.afoprograms.org/wp-content/uploads/2009/03/children-in-the-fields-report-2007.pdf
Here's a list of links to organizations.
Human Rights Watch
http://www.hrw.org/support-care
-Human Rights Watch report "Fields of Peril: Child Labor in US Agriculture": http://www.hrw.org/en/reports/2010/05/05/fields-peril-0
Farmworker Justice
http://www.farmworkerjustice.org/resources-publications/articles-and-reports/weeding-out-abuses
Office of Migrant Education
http://www2.ed.gov/about/offices/list/oese/ome/index.html
Harvest of Hope Foundation
http://www.harvestofhope.net/