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Wiki. - The Carnation Revolution was a military coup by military officers that overthrew the Estado Novo government on 25 April 1974 in Lisbon, producing major social, economic, territorial, demographic, and political changes in Portugal and its overseas colonies through the Processo Revolucionário Em Curso.

It resulted in the Portuguese transition to democracy and the end of the Portuguese Colonial War.

.. By the 1970s, nearly a half-century of authoritarian rule weighed on Portugal. The 28 May 1926 coup d'état implemented an authoritarian regime incorporating social Catholicism and integralism. In 1933, the regime was renamed the Estado Novo (New State). António de Oliveira Salazar served as Prime Minister until 1968.

In sham elections the government candidate usually ran unopposed, while the opposition used the limited political freedoms allowed during the brief election period to protest, withdrawing their candidates before the election to deny the regime political legitimacy.

The Estado Novo's political police, the PIDE (Polícia Internacional e de Defesa do Estado, later the DGS, Direcção-Geral de Segurança and originally the PVDE, Polícia de Vigilância e Defesa do Estado), persecuted opponents of the regime, who were often tortured, imprisoned or killed...
https://en.wikipedia.org/wiki/Carnation_Revolution