Cruel and oppressive government or rule.
A nation under such cruel and oppressive government.
When I think of tyranny, I think of oppressive forms of government that we have seen from time to time around the world. Tyranny is marked by cruelty and oppressive government rule. Cruel AND oppressive. All governments by their nature are oppressive in that the force a certain amount of compliance to customs and societal norms within their borders. Whether or not the inhabitants find it too oppressive is always subjective. Cruelty is another thing entirely. Cruelty AND oppression are key notes of governments such as those marked by leaders like Idi Amin, Saddam Hussien, and Mohammar Ghadaffi (forgive the spelling I really don't care enough about those people to bother looking up how they'd like to have history remember exactly how they constructed their names).
Eating your subjects - well, that is cruel indeed. Sending your sons out to collect free range women and raping and killing them - yup I'd find that cruel too. Killing your political opponents and any who disagree with you - cruel and oppressive indeed (mostly oppressive since you could make a cold logical argument that elimination of opponents is good for your ruling caste if you get rid of them "humanely" but I won't bother here to split that hair).
Forcing people to pay taxes is hardly cruel or oppressive. Forcing people to take care of themselves with regard to emergency medical conditions, well I don't really see that as cruel or oppressive (but we have seen people define President Obama's health care insurance requirement in that way, but I personally don't - those same people usually also find regulations stopping them from pouring used oil in waterways, and limits on how many fish they can pull out of a lake and the like oppressive) . Recently ...