https://en.wikipedia.org/wiki/Chiang_Kai-shek#Mass_deaths_un...

https://en.wikipedia.org/wiki/Constitution_of_the_Republic_o...:

Following the ROC government's retreat to Taiwan on 7 December 1949, the Temporary Provisions together with martial law made the country an authoritarian one-party state despite the constitution. Democratization began in the 1980s. Martial law was lifted in 1987, and in 1991 the Temporary Provisions were repealed.

ROC has been democratic since the 01990s, but it was an authoritarian dictatorship that killed millions of its own people at the time the Communists drove it out of the mainland (only to exceed its atrocities with their own) and for decades afterwards.