Medical historians say the death of Clara Maass also created a public protest over the use of humans in yellow fever research.

VOA: special.2010.05.18

South Korean farmers have held occasionally violent demonstrations over the years, and several farmers have committed suicide to protest the agreement.

VOA: standard.2009.04.22

On Thursday,a close aide to British Defense Secretary Bob Ainsworth resigned in protest over the war.

VOA: standard.2009.09.04

The president triumphed with the passage of the North American Free Trade Agreement, but it came only over loud protest from within his party, and with near-unanimous support of congressional Republicans.

CNN: Bill Clinton

Fellow board member Thomas Perkins quit in protest over the process of the investigation.

FORBES: Hewlett-Packard's Ripple Effect

Jersey's main nursing unions have planned a rally on Saturday in protest over pay and conditions.

BBC: Jersey nurses 'may get higher pay deal'