Seoul police will deploy about 200 traffic officers on Labor Day as the country’s two major umbrella unions plan large rallies and marches in the capital, raising the prospect of heavy congestion in central Seoul and Yeouido. The Korean Confederation of Trade Unions plans to hold preliminary rallies from 1 p.m. Thursday around Jongno, Euljiro and Yulgok-ro, before staging its main rally at 3 p.m. on Sejong-daero between the Sejong and City Hall intersections. The group is scheduled to begin marc