Jueves negro (English: "Black Thursday")[citation needed] was a violent series of political demonstrations that created havoc in Guatemala City on 24 and 25 July 2003.
In May 2003, the Guatemalan Republican Front (FRG) political party selected former military dictator Efraín Ríos Montt as its candidate for the forthcoming November general election.
On 24 July, the day known as 'jueves negro', thousands of masked FRG supporters invaded the streets of Guatemala City, armed with machetes, clubs and guns.
They were led by well known FRG militants, including a well known member of Congress, who was photographed by the press early in the morning while co-ordinating the actions, and the secretary of Ríos Montt's daughter, Zury.
In a related case, Carlos Ríos and four other members of the FRG were sentenced to three-year prison terms for racial discrimination (Guatemala's first such prosecution) for having levelled ethnic slurs at Nobel Peace Prize winner Rigoberta Menchú during a later challenge lodged with the Constitutional Court.