The Moon administration must be really upset about the criticism they are facing from the KCTU, a major leftwing ally to arrest their leader like this:
The Korean Confederation of Trade Unions (KCTU) has pledged an all-out struggle against the government, following the arrest of its Chairman Kim Myeong-hwan, last Friday.
The arrest and the militant umbrella union’s response signal yet another low point in the already strained ties between labor and the Moon Jae-in administration. The latter had hoped for talks with the labor sector to settle various labor issues such as the ratification of key conventions of the International Labor Organization (ILO) and a decision on next year’s minimum wage.
Kim, former leader of the Korean Railway Workers’ Union, was charged with overseeing “illegal” KCTU protests in front of the National Assembly in Seoul in May last year and earlier this year. During the rallies, labor activists clashed with police officers, tearing down fences and plastic shields to get inside the assembly compound to stop anti-labor bills.
Three others in the hardline union were arrested on similar charges recently. The clampdown and arrests of union leaders are hardly novel but they reveal how quickly ties can unravel between the labor sector and President Moon, who promised liberal and worker-friendly reforms when he came to power in May 2017.
The KCTU immediately lashed out at the arrest, saying Kim could not be held responsible for incidents of violence between protesters and police.
Korea Times
You can read more at the link, but the KCTU is upset that President Moon has not kept his promise to further increase the minimum wage. The steep increases in the minimum wage have already increased unemployment which the KCTU apparently is not concerned about.
