The “Big 6” pesticide makers (BASF, Bayer, Dow, Dupont, Monsanto, and Syngenta) are putting up big money — especially Monsanto and Dupont (full name E. I. Dupont de Nemours). That’s because all of the Big 6 either produce GMO seeds themselves, or pesticides that work in concert with the seeds, so they have the biggest vested interest in seeing GMO proliferation fly under the radar of most Americans.

The names behind processed foods are also getting in on the fight — like PepsiCo, whose many sub-brands sell many foods and beverages that contain GMO high-fructose corn syrup, soy lecithin, etc. So are the companies behind quite a few “health food brands” — from Kashi to Gardenburger to Silk. In fact, the Cornucopia Institute just released a handy shopping guide to help eaters keep their dollars from going to help oppose Prop 37.