When Do Protests Actually Work? — with Erica Chenoweth

What It Covers

Harvard Kennedy School political scientist Erica Chenoweth analyzes what makes nonviolent resistance movements succeed or fail, evaluating the No Kings protests against four research-based criteria, discussing the 3.5% participation threshold, South Korea's 2024 coup reversal, and the critical role of business community defections in democratic movements.

Key Questions Answered

• •Four Success Factors: Movements succeed when they achieve four things: large diverse participation building momentum, defections within the opponent's institutional pillars (political, security, business, cultural), shifting between protest methods and non-cooperation tactics, and maintaining nonviolent discipline under escalating repression. Movements failing on even one factor significantly reduce their probability of success.
• •Informed Pillar Strategy: Chenoweth's computational study tested three strategies and found that targeting pillars already on the fence — rather than mass mobilization or random pillar targeting — succeeds fastest. Activists should research which institutions, corporations, or officials show existing hesitation and focus pressure there first to trigger a cascade of defections.
• •3.5% Threshold: A historical observation across 323 mass movements from 1900–2006 shows no campaign exceeding 3.5% of national population participation ever failed. For the US, that equals roughly 12.25 million people. The No Kings protests grew from 7 million to 9 million participants, but Bahrain's 6% mobilization still failed due to zero defections.
• •Protest-to-Election Pipeline: Participation in single-day protests has measurable electoral consequences. Women's March 2017 participation correlated with the 2018 Democratic congressional wave. Black Lives Matter 2020 protests correlated with presidential election outcomes and progressive DA wins. Tea Party protests correlated with 2010 midterm results, suggesting 2026 midterms face similar structural pressure.
• •Umbrella Formation Requirement: Successful democratic reversals — South Africa's United Democratic Front, Chile under Pinochet, South Korea's trade union coalition in December 2024 — all featured an umbrella organization coordinating existing movements. South Korea's unions credibly threatened a national work stoppage within hours of martial law declaration, causing military leadership to hesitate and the coup to collapse within one day.