One incident involving Socrates and the Thirty Tyrants would later become an issue at his trial. Although the Thirty normally used their own gang of thugs for such duties, the oligarchy asked Socrates to arrest Leon of Salamis so that he might be executed and his assets appropriated. Socrates refused to do so. Socrates would point to his resistance to the order as evidence of his good conduct. On the other hand, Socrates neither protested the decision nor took steps to warn Leon of Salamis of the order for his arrest--he just went home. While good citizens of Athens were being liquidated right and left, Socrates--so far as we know--did or said nothing to stop the violence.
The horrors brought on by the Thirty Tyrants caused Athenians to look at Socrates in a new light. His teachings no longer seemed so harmless. He was no longer a lovable town eccentric. Socrates--and his icy logic--came to be seen as a dangerous and corrupting influence, a breeder of tyrants and enemy of the common man.
THE TRIAL
A general amnesty issued in 403 meant that Socrates could not be prosecuted for any of his actions during or before the reign of the Thirty Tyrants. He could only be charged for his actions during the four years preceding his trial in 399 B.C.E. It appears that Socrates, unchastened by the antidemocratic revolts and their aftermaths, resumed his teachings and once again began attracting a similar band of youthful followers. The final straw may well have been an another antidemocratic uprising--this one unsuccessful--in 401. Athens finally had enough of "Socratified" youth.
In Athens, criminal proceedings could be initiated by any citizen. In the case of Socrates, the proceedings began when Meletus, a poet, delivered an oral summons to Socrates in the presence of witnesses. The summons required Socrates to appear before the legal magistrate, or King Archon, in a colonnaded building in central Athens called the Royal Stoa to answer charges of impiety and corrupting the youth. The Archon determined--after listening to Socrates and Meletus (and perhaps the other two accusers, Anytus and Lycon)--that the lawsuit was permissible under Athenian law, set a date for the "preliminary hearing" (anakrisis), and posted a public notice at the Royal Stoa.
The preliminary hearing before the magistrate at the Royal Stoa began with the reading of the written charge by Meletus. Socrates answered the charge. The magistrate questioned both Meletus and Socrates, then gave both the accuser and defendant an opportunity to question each other. Having found merit in the accusation against Socrates, the magistrate drew up formal charges. The document containing the charges against Socrates survived until at least the second century C.E. Diogenes Laertius reports the charges as recorded in the now-lost document:
This indictment and affidavit is sworn by Meletus, the son of Meletus of Pitthos, against Socrates, the son of Sophroniscus of Alopece: Socrates is guilty of refusing to recognize the gods recognized by the state, and of introducing new divinities. He is also guilty of corrupting the youth. The penalty demanded is death.