Monsanto's glyphosate-resistant crop strains are not even active, until the farmer makes a further purchase of an activation product.
And then there is their practice of selling 'terminator' strains of seeds to third world farmers, who would traditionally have kept back seed from their last harvests to plant come the next year so they can remain self sufficient. The terminator strains on the other hand are genetically modified to produce infertile seed, forcing farmers to buy more Monsanto seed the next year.
There can BE no other reason for this other than to enforce a continued enslavement to them, why else would such infertile races of seed be a valid product? Other, than perhaps, scientific experiments involving entirely new genetic modifications etc. when one wishes to be absolutely certain that an unknown quantity cannot then spread and infect other surrounding ecosystems. Then, yes, but for bulk food production this is not acceptable.