Tens of thousands of South Koreans protest imports of U.S. beef . Beef imports largely banned since 1990 when mad cow cattle arrived in Korea . CNN 's Sohn Jie-ae contributed to this report . Protests essentially paralyzed the government of President Lee Myung - bak .
Tens of thousands of South Koreans protest imports of U.S. beef . Beef imports largely banned since 1990 when mad cow cattle arrived in Korea . Protests essentially paralyzed the government of President Lee Myung - bak .