Abstract: The subject of this research is the opposition of global federations of trade unions that are an industry branch of the world trade union movement to the practice of implementation by the multinational corporations of precarious work and other forms of social dumping, which represents a threat to exercising of the socioeconomic rights of employees. The object of this research is the world trade union movement as a participant of international relations. The author analyzes the experience of holding by the International Transport Workers' Federation – the leading global federation of the transport workers of campaigns against the “flags of convenience” as a form of counteracting the social dumping in the branch of maritime traffic. The article also examines the evolution of applied forms and methods of work throughout over 50 years of experience in holding the campaigns. The main conclusion lies in the need for expanding the range of countermeasure of all branches of the world trade union movement against social dumping considering the acquired experience. The author’s special contribution consists in generalization of practice of opposition of the International Transport Workers' Federation in the course of running campaigns against the “flags of convenience” to the forms of social dumping by the multinational corporations.