The former mayor of Greece's second city, Salonika, and two of his top aides were sentenced to life in prison on Wednesday after being found guilty of embezzling almost 18 million euros, or $23.5 million, in public money — a rare conviction in a case involving the political corruption that has contributed to the country's dysfunction and economic decline. A court in Salonika, a northern port city also known as Thessaloniki, found that the local authorities had set up an "embezzlement machine" and that...