The Taiwan Provincial Garrison Command was established on September 1, 1945, in Chongqing, with Chen Yi as its first commanding general. Its initial mission was straightforward: repatriate Japanese nationals from Taiwan, transfer authority to the Republic of China government, and maintain order. The agency relocated to Taipei in 1947, but "maintaining order" quickly took on a darker meaning. In the chaos following the February 28 incident, the command's successor organizations were directly involved in the systematic killing of thousands of Taiwanese social elites, people whose only crime was prominence in a society the new government did not yet trust. By 1949, as the ROC retreated to Taiwan in the final stages of the Chinese Civil War, Chen Cheng declared martial law. The Garrison Command was ordered to enforce it.

Commanded by a three-star general, the Garrison Command drew personnel from the Army, Marine Corps, Military Police, Political Warfare, and the Intelligence Bureau, supplemented by members of the National Police Agency and specially trained civilian recruits. Its mandate was breathtaking in scope: suppress communism, suppress democracy, suppress Taiwan independence. In practice, this meant the organization's reach extended into every sphere of life. It censored publications, confiscated newspapers, tapped telephone lines, monitored radio broadcasts, imprisoned political dissidents without trial, and, according to persistent allegations, carried out politically motivated assassinations. The arrest of professor Peng Ming-min for advocating self-determination, the Kaohsiung Incident in which pro-democracy demonstrators were beaten and jailed, the murder of opposition politician Lin Yi-hsiung's family in 1980 while he was in custody -- these cases defined an era.

The people who suffered under the Garrison Command were not abstractions. They were professors, lawyers, writers, students, and ordinary citizens whose private conversations or public statements drew the attention of an agency that considered democratic aspiration a security threat. Dr. Chen Wen-chen, a Carnegie Mellon University professor who returned to Taiwan for a visit, was found dead after being taken in for questioning in 1981. Lin Yi-hsiung's mother and twin six-year-old daughters were stabbed to death in their home while he was detained by the command, a crime that remains unsolved. These were not wartime casualties or collateral damage. They were deliberate acts of violence against people who sought a different kind of Taiwan.

Martial law lasted until July 14, 1987, when President Chiang Ching-kuo lifted it by presidential order. But the Garrison Command lingered for five more years, losing its remaining legal justification only on April 30, 1991, when President Lee Teng-hui declared the end of the Period of Communist Rebellion. On August 1, 1992, Lee quietly ordered the command restructured into the Coast Guard Command and Military Reserve District Command. The disbandment distributed its functions across a dozen agencies: coastal patrol went to the Coast Guard, electronic surveillance to the Military Intelligence Bureau, riot control to the National Police Agency, and censorship duties to the Government Information Office, which later abolished them entirely. Prison facilities were transferred to the Military Police Command or converted into memorial sites.

Taiwan's transitional justice process began shortly after the Garrison Command's dissolution. The period of authoritarian rule it enforced, known as the White Terror, left scars that Taiwan continues to reckon with. In 2019, President Tsai Ing-wen vowed to open White Terror files to public scrutiny. The former Garrison Command headquarters in Taipei stands as a physical reminder of an era when the state's security apparatus considered its own citizens the enemy. That Taiwan transformed itself from a martial-law autocracy into one of Asia's most vibrant democracies is remarkable. That it did so without civil war or revolution, by slowly dismantling the very institutions that had held it in place, may be the most remarkable thing of all.