This special issue of the Journal of Online Trust and Safety, guest edited by Tongtong Zhang, brings together research on state-society collaboration for online harassment in authoritarian and semi-democratic regimes. It includes two papers on coordinated mass reporting of social media accounts for allegedly violating platform policies. Both papers leverage interviews with targets of harassment campaigns – a challenging task in repressive contexts – and examine the strategic ambiguity of the actors responsible for these campaigns. Additionally, the issue features an introductory essay that highlights how these tactics complement other pro-government repressive measures online. The Journal of Online Trust and Safety is grateful to the Omidyar Network for their generous support.