That is true, soy is labeled. I had forgotten about that. Corn is not labeled. I know there are groups pushing that though, so maybe someday it will be. I found out that laundry soap is made with corn as is the sticky on envelopes that you lick to seal it. So these products can be a threat even without being in food, depending on how it affects someone.
Pat it is my understanding that almost all of the soy grown in the US is GMO. Maybe that is why. I don't know about corn, or wheat but I bet it mostly is too. I wonder if that is why so many people are developing allergies and gluten intolerance ect. When I was little, I ate wheat and it didn't bother me, corn also. But now I cannot eat it. The corn and wheat are the worse for me.