jackboots
n. (过膝的军用)长筒靴( jackboot的名词复数 ); 铁靴政策(强迫别人屈服的粗暴手段),压迫者; 马靴
Jackboots are heavy boots that come up to the knee, such as the ones worn by some soldiers.
If a country or group of people is under the jackboot, they are suffering because the government is cruel and undemocratic.