Korea massive demonstration against taint food from China?

Recently the people of South Korea held massive demonstrations to denounce the plan to allow the importation of beef from the United States of America. There has been an embargo (ban) on American beef since 2003. That was the year of the one cow in the state of Washington which was imported from Canada, to have had mad cow. The cow was identified before the cow entered the food chain.

These demonstrations must have been communist inspired exploiting the emotions of the South Korean people. Because if the good people of South Korea were that concern about their food, when did they hold similar demonstrations protesting the import of tainted food, medicine, and toys from Communist China.