SMH IS Sindikat metalaca Hrvatske – Industrijski sindikat (SMH-IS) was established in 1990 with the aim to promote and protect the economic and social interests of metalworkers. SMH – IS stands for social development and the rule of law, democratization and economic development, protection of human and trade union rights, and promotion of health and safety at work.

SMH-IS is affiliated with the Union of Autonomous Trade Unions of Croatia (SSSH), IndustriAll, International Metalworkers Federation (IMF), European Trade Union Confederation (ETUC) and Autonomous Trade Unions of Croatia (UATUC).