I love the NSA. It's like having a secret fan-base you will never see, but they're there, watching everything you write and it makes me feel all warm and fuzzy inside knowing that I may be some person's only form of unconstitutional entertainment one night.
If a government forces a group of people to free their slaves against the slave owners consent, is that an act tyranny? According to your definition, which is "any act which forces compliance from the unwilling", that is tyranny.
If that's tyranny, give me tyranny any day.