Why do you feel compelled to use obviously loaded terms like "kingpin" and "autocrat" as if people can't be trusted to evaluate the character of the leadership of U.S. adversaries without these nudges?
I want to know the further meaning of the word kingpin ,and whether it is pejorative?

See a translation

"Kingpin" has the connotation of an all-powerful leader, like a King, but not in the sense of government. It's more associated with Mafia and gangsters, such as Mob Bosses or Capos.

It's slightly pejorative, but not quite as pejorative as say, Despot or Tyrant.

There are many similar terms with only small differences, like Mogul, Head Honcho, Top Banana, Bigwig, Fat Cat, Aristocrat, etc. We use these terms for some government officials, but also anyone with a lot of power in a certain business or trade, like CEOs, Executives, Union Leaders, etc

A great example is in the Spider-Man comic books. There is a villain whose name is Kingpin. He fits the stereotypes of the word "kingpin" perfectly. He is rich, intimidating, big and strong, and runs all the organized crime in the city.