Which ancient Greek genius philosopher was made to execute himself by drinking a cup of poisonous hemlock as his sentence for publicly criticizing the ruling class?

Socrates was sentenced to death and forced to drink hemlock poison in 399 BCE for criticizing the ruling class of Athens and corrupting the youth. This is one of the most famous executions in philosophical history. Aristotle was Plato's student, Plato was Socrates' student, and Archimedes was killed during the Siege of Syracuse but not executed by hemlock.