This page contains information regarding Star Trek: Discovery, and thus may contain spoilers.
The logic extremists were a small faction of Vulcans during the 23rd century. Claiming to represent "true Vulcan ideology" and valuing logic above all, they were considered renegades and fanatics by other Vulcans. They regarded Humans to be inferior and particularly opposed Human involvement in Vulcan culture. (DIS: "Lethe")
Logic extremists bombed the Vulcan Learning Center in an attempt to kill the young Spock, as he was the child of Amanda and Sarek, which they viewed as contamination. This attempt resulted in his adopted sister, Michael Burnham being dead for three minutes before she was saved by Sarek. (DIS: "Lethe", "Point of Light", "Project Daedalus")
In 2256, the logic extremists sought to sabotage an intended peace meeting between Sarek and two Klingon Great Houses. The extremist V'Latak, who had been assigned to pilot the Vulcan cruiser transporting Sarek, gave himself an injection en route that caused his body to explode. This suicidal attack disabled the ship and severely injured Sarek. (DIS: "Lethe")