In this open letter Amnesty International expresses its concern that Michel Catuira, Filipino national and President of the Seoul-Gyeonggi-Incheon Migrants’ Trade Union (MTU) is being targeted for forcible, arbitrary deportation based on Catuira’s work on behalf of migrant workers’ rights. Amnesty International believes that the current immigration measures against Michel Catuira are the latest attempt by the South Korean government to crackdown on the legitimate activities of the MTU and to prevent migrant workers from freely exercising their rights to freedom of association and to form trade unions.