South African senates are formally charged with protecting academic voice, yet protection varies sharply with who votes, under what majority rule, and under what employment conditions dissent is voiced. Drawing on institutional theories of governance and histories of transformation in South African higher education, it conceptualises contentious speech as public criticism of university leadership, decolonisation positions, and language-policy dissent that carries differential career risk for insecure staff. It then specifies running variables, treatment assignments and scope conditions under which narrowly decided senate composition votes or contract-renewal cutoffs could isolate local causal quantities. The contribution is methodological and conceptual: it clarifies the mechanism linking procedural protection to self-censorship, distinguishes de jure senate authority from de facto protection, and sets falsification and validity conditions for future applications using administrative records.