The Nazi Party was composed of individuals, many of whom were evil. The Party itself... is a nonentity, a label. Nazis did evil; the Nazi Party formed a framework, just as XYZ Inc. forms a framework for, yes, evil deeds.
Fascism is a political philosophy. I'm divided in my own mind as to whether to call it "evil" or not; if followed, the ideology of Fascism certainly results in evil.
And yes, I consider it not merely incorrect, but itself evil to ascribe evil to other than a thinking being, a "person". The "personhood" of a corporation is a legal fiction, not a reality. Assigning evil to the gun rather than the wielder, the corporation rather than the executives, or the party rather than its members, excuses the wielder, the exec, and the members -- and if you excuse it, you participate in it.
Hypothetical example, which somebody may be able to find a concrete version of: the X Corporation, in obedience with the new ordnances, forbids smoking in the workplace. The smokers among the workers evade the new regime by sneaking out the fire exits to grab a smoke. The managers of the plant, concerned by the resulting decrease in productivity, order the security section to chain the fire exits shut. There is a fire in the plant, and several workers die because the fire exits couldn't be used.
What's going to happen?
Well, the X Corporation is obviously gonna get sued, right? And they'll lose, because X Corporation is obviously "guilty". So the widows, widowers, and orphans of the dead workers get a nice piece of change.
But who's really guilty? The _actor_ who caused the deaths is the security guard who physically chained the doors shut; and, under any reasonable definition of the terms, the exec who ordered that action is accessory before the fact and probably a conspirator, in other words just as guilty as the guard is; to my mind, more so, since he effectively extorts misbehavior from the guard by threat of dismissal if the doors aren't chained toot-sweet.
Under the existing system, the investors and stockholders of X Corporation -- many, if not most, of whom knew nothing of the action and would not have condoned it if they did -- get a substantial portion of their wealth taken away, to pay the WWO and their lawyers. The security guard who obeyed orders gets fired. And the executive who gave the order gets a bonus for constructive contributions to the legal effort, and goes home happy.
In other words: Hammer the uninvolved, punish the hapless, and let the real author of all those deaths go free with a fat check to console his conscience. If you want evil, as far as I'm concerned that's it.