Gruma

This New York Times article from 1996 explains how Gruma's cornflour brand Maseca benefited enormously from Government policies aimed at nothing less than changing the way Mexicans eat, substituting corn flour mass-produced by Maseca for the fresh corn dough that had been the staple for generations. Gruma CEO Roberto Gonzalez Barrera was lifelong friends with Carlos Salinas de Gortari, who was President of Mexico from 1988 to 1994.
Source: New York Times (1996)

This company has products that have been verified as compliant with the Non-GMO Project Standard, North America's only independent verification for products made according to best practices for GMO avoidance.
Source: Non-GMO Project (2016)

Gruma is defending a proposed class action (July 2013) over the labeling of its tortilla products. Lawyers for the proposed class contend food packaging with "All Natural" on it are false and misleading because they contain GMOs (genetically modified organisms), namely corn that is grown from genetically-modified seeds. The case was awaiting the FDA's determination as to whether GMOs can be defined as "natural." The FDA refused to do so and the case against Gruma was dismissed in 2014.
Source: news article (2013)

California, the UK and Australia have all enacted legislation requiring companies operating within their borders to disclose their efforts to eradicate modern slavery from their operations and supply chains. Follow the link to see this company's disclosure statement.
Source: Modern Slavery Registry (2016)

This blogger, author of 'Taco USA: How Mexican Food Conquered America' gives 5 reasons to hate Gruma: Lying about having invented processed corn flour; putting thousands of tortillerias out of business; subsidies from corrupt Mexican government officials; trying to monopolise the American market; their products are terrible.
Source: blog site (2012)