“THE BEEF HORMONE DISPUTE is one of the most intractable agricultural controversies since the establishment of the World Trade Organization. The European Union banned the import of meat that contained artificial beef hormones … Canada and the United States opposed this ban, taking the EU to the WTO Dispute Settlement Body. In 1997, the WTO ruled against the EU. The EU appealed the ruling.”
http://en.m.wikipedia.org/wiki/Beef_hormone_controversy