How dangerous were the dictators towards world peace in World War II?

Which dictators? FDR? Churchill? Stalin? The dictators in South America? In Asia?

They all imposed price controls, rationing, strict labor controls, bans on certain trade or ownership, jailed those not willing to be drafted or serve in combat, moved civilian populations involuntarily, and whole host of other authoritarian measures.

Therefore, the use of the Word "dictator" is sloppy, imprecise, and leads to nothing more than subjective opinions in a question like this one.

If it is intended to mean only Axis leaders, then the phrasing of the question betrays a Western culture bias (typical of the winners in any war!) and the cumulative effects of the constant media Propaganda of today that the "other side's leaders were the only big bad guys and we are oh so good."

For that matter, has "world peace" ever existed on this planet. There are always Tutsis fighting Hutues, or border skirmishes, somewhere going on. I doubt that "world peace" has ever existed, even for a few minutes!