Groupthink is a Cravers-specific technology on the Diplomacy and Trading technology tree with a research cost of 1800 . It unlocks one Empire Improvement, requires research in Quantum Swarming, and allows no further research.
"While Craver workers and drones were once mindless slaves, the advanced needs of a starfaring nation forced society to give them greater levels of intelligence and autonomy. However, new mass techniques of mind control have been developed to prevent these lower classes from becoming restless."
"A network of state propaganda transmitters, installed throughout the system, emphasize the glory of the Craver military while transmitting soothing subliminal messages."