If GM companies have control of the production of crops, it'll affect the livelihoods of the armers who rely on it.
This has been my issue with GM for some time now. Traditionally, farmers have been able to recover seeds from their crops to replant, but new GM 'agreements' state that they are not allowed to do so. Taking ownership of the crop on someone's field just seems incredibly wrong to me, from at least a moral standpoint.
It's so wrong. And Monsanto did the same thing! Look at what happened with Indian farmers - they had hugely high rates of suicide due to Monsanto's practices which did NOT benefit them or the land in the end.