under the rule of a dictatorial system – 專制政體下 [jeonje-jeongcheha]
Etymology
專制 (전제) [jeonje] – autocratic; dictatorial;
政體 (정체) [jeongche] – government system;
下 (하) [ha] – below; bottom; lower; underneath;
phrase (구절), sino-korean
Hanja characters: 體