"Once a year, the citizens voted on whether or not they should hold an ostracism. If the majority voted yes, each member of the Assembly then wrote on an ostrakon (potsherd) the name of the person he felt the city could best do without. Whoever turned up on the most ostraka was banished for ten years, after which time he could return, his property still intact. In this way, would-be tyrants--and not a few other nuisances--were eliminated. (If at first the primitiveness of this procedure shocks you, consider for a moment what benefits it could bring to your city.)"
1) Sounds a bit like Survivor.