Reply #20: Left-leaning (and right-leaning) is too narrow for either, as both were a mix.

[boppers]

Baathists and Nazi's both supported some pretty leftist views:
Seizing private property and industry for the collective good of the state
Equality of women in government
Public education
After-school programs for teens
Nationalized infrastructure (roads, trains, power, water)
Championing "the worker"

I could go on, but in general, a dangerous mix is created when leftist views come enforced at gunpoint, and the levers of power are unchecked by viable opposition.