ATHENS, Greece (AP) — Thousands of angry farmers from across Greece converged on central Athens on Friday, driving dozens of tractors to parliament, horns blaring, for an overnight rally to protest what they say is the government’s failure to address problems threatening their ability to produce crops. Police blocked off central streets in the Greek capital and accompanied the tractor motorcade through the center of the city as it made its way to central Syntagma Square in front of the parliament building, the traditional focal point of protests in Greece. Farmers have been protesting for months over high production costs, low prices for their products and delays in the payment of European Union-backed subsidies.