By Gavin Jones ROME (Reuters) – Italy’s largest ruling party has proposed legislation to raise government revenues by making it more expensive for multinational online companies like Google, Amazon and Yahoo to do business there. A bill tabled by the center-left Democratic Party (PD) aims to raise at least 1 billion euros through a law, dubbed the “Google Tax”, obliging companies that advertise and sell online in Italy to do so only through agencies with a tax presence in the country. The proposal would not tax the multinationals directly but would force them to use Italian companies to place their advertisements, rather than doing so through third parties based in low-tax countries like Luxembourg, Ireland or outside the European Union. The state would benefit from tax levied on the extra income of Italian advertising agencies and Internet service providers.