Chun Doo-hwan Seizes Power: South Korea's May 17, 1980 Coup
On May 17, 1980, South Korean army general Chun Doo-hwan extended martial law across the entire nation, shuttered universities, and arrested opposition politicians to crush a growing pro-democracy movement. The move cemented his grip on power just months after he had already seized control of the military in a December 1979 coup, and it triggered a bloody uprising in the city of Gwangju that would haunt Korean politics for decades. Chun's actions that spring set the stage for his formal presidency and the authoritarian Fifth Republic that followed.
From Coup to Crisis
Chun Doo-hwan's path to power began in the chaos following the assassination of longtime president Park Chung-hee on October 26, 1979. As head of the Defense Security Command, Chun led a group of officers in the December 12, 1979 coup, arresting the army chief of staff and effectively taking control of South Korea's military without civilian authorization. Over the following months, he consolidated power behind the scenes while a fragile civilian government under President Choi Kyu-hah nominally remained in place. Meanwhile, the political thaw known as the "Seoul Spring" saw students, workers, and opposition figures demand genuine democratic reforms and an end to military influence in politics. By May 1980, massive student demonstrations were spreading across major cities, and Chun viewed the unrest as a direct threat to the order he had spent months building through backroom maneuvering and intimidation of rivals within the officer corps.
Did You Know?
Chun Doo-hwan initially received a death sentence in 1996 for his role in the 1979 coup and the 1980 Gwangju massacre, becoming one of the few former heads of state anywhere to be criminally convicted for actions taken while seizing power, before a presidential pardon spared him from execution.
The May 17 Martial Law Decree
On May 17, 1980, Chun and his allies pushed South Korea's cabinet to expand martial law nationwide, a decree that had previously been limited following Park's assassination. The government banned all political activity, closed universities and colleges, suspended the National Assembly, and imposed strict press censorship. Troops arrested prominent opposition leaders, most notably Kim Dae-jung, who was later charged with sedition and sentenced to death before international pressure forced a commutation. The crackdown was designed to eliminate any organized resistance to Chun's rise, silencing both moderate politicians and student activists in a single sweeping action. The decree's harshness, however, sparked immediate and fierce backlash in the southwestern city of Gwangju, where citizens and students refused to accept the closure of their university and the arrest of local leaders.
Gwangju Uprising and the Fifth Republic
Beginning May 18, 1980, residents of Gwangju rose up against the martial law troops sent to enforce Chun's decree, seizing weapons and briefly driving soldiers from the city. The military responded with overwhelming force, and by the time the uprising was suppressed on May 27, hundreds of civilians, and by some estimates well over a thousand, had been killed, making it one of the deadliest crackdowns in modern Korean history. With opposition crushed and the military firmly in control, Chun formally became president in August 1980 through an indirect vote by an electoral college, inaugurating the authoritarian Fifth Republic. He ruled until 1988, when growing democratic pressure and the approaching Seoul Olympics forced constitutional reform and a peaceful transfer of power to his successor, Roh Tae-woo. In 1996, a South Korean court convicted Chun of treason and mutiny for the 1979 coup and the Gwangju massacre, sentencing him to death before he received a pardon in 1997; he died on November 23, 2021, at age 90.