There are controversies around GMOs (Genetically Modified Organisms) on several levels, including whether making them is ethical, whether food produced with them is safe, whether such food should be labeled, and if so how.
The company at the center of the controversy is Monsanto, formerly a chemical company.
That a chemical company like Monsanto, which invented Agent Orange and used to manufacture products such as the insecticide DDT, PCBs, and recombinant bovine somatotropin is now a major food producer should have everyone concerned.
If you have a strong stomach I would encourage you to watch this eye opening documentary:
The World According to Monsanto GMO Documentary
The fight is on all over the planet. In the US citizens are demanding a repeal of the Farmer Assurance Act, aka the "Monsanto Protection Act".
No one should have to choose between a government shutdown and food safety!
Fortunately there is a growing movement and a very large push underway to have the language repealed and it has broad bi-partisan support so chances are quite good that the act will be repealed very soon.
I would encourage any other Americans on this forum to take a few minutes to add your name to the following petition that will be sent to the Congress and President to instruct them to repeal the Farmer Assurance Act as soon as possible:
MoveOn Petitions - Repeal the "Monsanto Protection Act" (Section 735 of HR 933)
Another excellent resource: Food Democracy Now
And the March Against Monsanto facebook page, 162k likes and growing FAST: https://www.facebook.com/MarchAgainstMonstanto