I had this question in mind for a while since I were doing a search for stuff to post here related to Shadaloo Dolls and Shocker Female Combatants. Then the question appeared.

For you which is the Best Evil Organization that has brainwashed soldiers? Even if these has non-official soldiers in their army, just like the Team Rocket for example.

The Borg

I think the best evil organisation is the one you create yourself.

Also I don't count the Borg as evil and see the creation of a global hivemind as the only ultimate solution to humanity's social and political issues.

Wiping and/or obsoleting every present notion of society and politics would Indeed solve all issues with them.

In the same way replacing a head with a pineapple might solve brain cancer:P

Also the borg are headed by power tripping central nodes called queens, and their network has rebel drones using a virtual space to organize a resistance, so.

I'm gonna say the borg count.

The Jedi Order.

They take youngling from their families and isolate them. Then they make acceptance of The Order's doctrine a condition of acceptance... for little youngling who are separated from their parents.

That is Cult Brainwashing 101. That is vile and reprehensible.

They teach that normal family attachments are bad and that they will lead to the "Dark Side".

They teach that suffering leads to the Dark Side.

So ... suffering isn't just unpleasant. It will turn you evil? So the path is to deny suffering?

They use these tactics to mind-control their own members to the point where they have all been brainwashed by it without knowing it.

On top of that, they have become dependent on their political power. They serve the will of The Senate, not the Force. At least until the Senate pisses them off. Then they're ready to conquer it.

Oh yeah!! They actually possess genuine mind-control powers that they use. During the last great war with the Sith (who are at least honest about who they are), they used their mind-control powers to make parents surrender children to The Order to increase their numbers.

The Sith may be more destructive than the Jedi. But the Jedi are almost as evil.

Hmm. Maybe that makes them the worst evil organization, not the best.

Wasn't there a game where you play as a padawan who is later to be reveled that you were the leader of the dark side but had your memories erased?

Knights of the old republic maybe? It's been a while since I last played it but I really loved it and also when they basically brainwash one of your allies to serve the dark side...