THE ROLE OF THE ALL-INDONESIAN TRADE UNION (SPSI) IN REALIZED WORKERS’ WELFARE IN PADANG HILIR DISTRICT, TEBING TINGGI CITY. OPINI: Journal of Communication and Social Science, [S. l.], v. 2, n. 2, p. 60–69, 2025. DOI: 10.70489/s6y30498. Disponível em: https://journal.aspublisher.co.id/index.php/opini/article/view/871.. Acesso em: 2 oct. 2025.