A Leftist tyrant is a particular kind of pretentious tyrant that tries to justify his conduct based on progressivism, public health, or even Rule of Law. Scientism, with circular reasoning using atheistic science, can be the disingenuous basis used by a Leftist tyrant.
He or she can be a career bureaucrat, a life-tenured judge, a university professor, or even a judge.
In contrast with liberals of the 1960s, a Leftist tyrant is opposed to genuine freedom of speech and will use liberal censorship to advance his goals.
Some of the vaccine police are Leftist tyrants who simply use the COVID vaccine as a means of abusing power.