Who was the most compelling villain in The X-Files conspiracy arc?

Conspiracies
The X-Files
The X-Files
TV
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Conspiracies
The X-Files
The X-Files
- The Cigarette Smoking Man
- Alex Krycek
- The Syndicate
- The Super Soldiers

The X-Files
The X-Files
TV
Conspiracies
The X-Files
The X-Files