This article is an examination of courageous behavior as manifested in the activities of American whistleblowers and environmental activists in the United States, Israel, and the former Czechoslovakia. It examines how these dissenters against illegal or unethical behavior were able to sustain their demand for accountable behavior by government and industry. The article, which draws upon interviews with sixty-four whistleblowers and one hundred and forty activists, union officials, business executives and journalists, focuses on the significance of social capital in generating protest; the whistleblowers' and activists' strong cultural commitment to the efficacy of action; their determination to accumulate the evidence and expertise; their ability to secure strategically placed allies; and their mechanisms for overcoming fear and intimidation. The authors conclude by indicating the significance of sociology in analyzing, legitimizing, and publicizing the contributions of courageous individuals to the creation and maintenance of a democratic society.