Subject: Human Rights Watch Amicus Curiae on abuses against human rights defenders José Miguel Vivanco, on behalf of Human Rights Watch, located at 350 Fifth Avenue, 34th floor, New York, United States, presents this amicus brief to the Honorable Constitutional Court of Colombia in the case T8018193, 11001310304520200002500 concerning ongoing abuses against human rights defenders and social leaders in Colombia. We respectfully state: Purpose and Summary of this Submission Human Rights Watch respectfully requests that the Colombian Constitutional Court accept this submission and consider its factual and legal arguments, which are relevant to the court’s assessment of this case. Human Rights Watch regularly monitors the human rights situation in Colombia, including killings and other abuses against human rights defenders and social leaders in the country. Most recently, in February 2021, Human Rights Watch published a comprehensive report documenting killings of human rights defenders in the country in the last five years, as well as serious shortcomings in government efforts to prevent the killings, protect defenders, and hold those responsible to account. The 127-page report, “Left Undefended: Killings of Rights Defenders in Colombia’s Remote Communities,” is attached to this amicus brief.