The Thirty severely reduced the number of, and rights of, Athenian citizens. Instead of all Athenians participating in legal functions, only 500 specially selected could. Only 3,000 people had the right to carry weapons or receive a jury trial. Hundreds of Athenians were killed (they were ordered to drink hemlock) and thousands were exiled.
The Thirty Tyrants were overthrown by Thrasybulus with help from Thebes.