Which name belongs to both a legendary city of gold and a Cadillac model discontinued in 2002?

A left-wing American magazine bears the nickname of which Cork-born labor organizer? Which word means both a leg joint of meat and to pawn something? What is a legal document that transfers ownership of land called? According to a legend, which British king was seen in 1788 having a conversation with an oak tree? A leghorn is a breed of which farm bird? A lepidopterist studies which insects? Which Leslie Nielsen film comedy series was based on the TV show "Police Squad!"? Which ruthless Russian ruled as tsar from 1547 to 1584?