Menon (in Greek Mένων) was a workman working with Phidias, who was bribed by Pericles' enemies to inform against Phidias. According to Plutarch he sat himself in the market-place begging for protection if he were to bring charges against Phidias. He was subsequently provided with safety by the state and exempted from public duties. (Plutarch, Pericles 31)
References
Menon (Phidias) Wikipedia(Text) CC BY-SA