Some of the international and regional frameworks that create a mandate to address the issue are:
The Convention on the Elimination of Discrimination against Women, interpreted with General Recommendation 19
Inter-American Convention on the Prevention, Punishment, and Eradication of Violence against Women (Convention of Belém do Pará)
The Beijing Declaration and Platform for Action
SDG5: Gender Equality
SDG 8: Decent Work and Economic Growth
ILO Convention 190: Violence and Harassment Convention
ILO Convention 111: Discrimination (Employment and Occupation) Convention
Additional relevant ILO Conventions are outlined in the publication Ending Violence and Harassment against Women and Men in the World of Work (pages 33-39)