Main article: Black May (1992)
In 1992, Bhumibol played a key role in Thailand's transition to a democratic system. A coup on 23 February 1991 returned Thailand to military dictatorship. After a general election in 1992, the majority parties invited General Suchinda Kraprayoon, a leader of the coup group, to be prime minister. This caused much dissent, which escalated into demonstrations that led to a large number of deaths when the military was brought in to control protesters. The situation became increasingly critical as police and military forces clashed with protesters. Violence and riots spread to many areas of the capital with rumours of a rift among the armed forces.
Amidst the fear of civil war, Bhumibol intervened. He summoned Suchinda and the leader of the pro-democracy movement, retired Major General Chamlong Srimuang, to a televised audience, and urged them to find a peaceful resolution. At the height of the crisis, the sight of both men appearing together on their knees (in accordance with royal protocol) made a strong impression on the nation, and led to Suchinda's resignation soon afterwards.
It was one of the few occasions in which Bhumibol directly and publicly intervened in a political conflict. A general election was held shortly afterward, leading to a civilian government.