Among the most crafty and cunny of all villains on our main parallel planets are Hector Hammond aka Wildcard of Earth-One and Charles Halstead aka Psycho-Pirate of Earth-Two. Each were brilliant, each were masters at mental manipulation, and each earned enmity with Green Lantern.
Hector Hammond was a petty thief until he came upon a meteor that could mutate humans, making them either advanced mentally or transform them into beasts. This led him to kidnap a handful of scientists whom he infected with the meteor rays, making them his minions, which led to his first conflict with Hal Jordan aka Green Lantern. Finding that he couldn't defeat Jordan even though he had a copy of Hal's power ring, he exposed himself to the meteor and mutated into a mental menace on Earth-One during his first of several conflicts with Lantern's Justice League of America, when he was working under Mister Memory. At one point, he actually mentally controlled their artificial foe known as the Shaggy Man, who was aboard their satellite headquarters, until Lantern defeated him. Hammond later took the alter ego Wildcard leading an incarnation of the Royal Flush Gang versus the League. Once more, he was defeated.
Charles Halstead was a linotyper for the Daily Courier who became discouraged at his lack of success in life. Employing schemes based on several human emotions, Halstead as the original Psycho-Pirate was able to manipulated both criminals and his eventually nemesis the Justice Society of America. When the Society defeated him, Halstead was locked in prison, but soon thereafter returned for two more schemes in subsequent years that led him once more toward battling the Society, including returning member Green Lantern. Eventually, caught as "William Watson", Halstead was sent to prison for decades. However, he knew of the existence of the Medusa Masks that could literally manipulated minds, but was to old himself to utilize them. So, he recruited his cellmate Roger Hayden into locating these masks once he was out of prison, and seek revenge versus the Society. Of particular note was when Green Lantern was turned evil by Hayden, the second Pirate, after the hero's alter ego Alan Scott lost his prized possession as the now bankrupt owner of Gotham Broadcasting Company. Once more, Green Lantern and the Society turned the tides on a Psycho-Pirate, although this version would return again and again alongside the Secret Society of Super-Villains.