Tens of thousands of New Zealanders rallied in front of parliament on Tuesday, in one of the country's largest ever protests to oppose a bill which opponents say seeks to dilute Maori rights and threatens to set race relations back decades. Massive crowds, estimated by police at 42,000, gathered at parliament, where the Treaty Principles Bill was introduced earlier this month by legislators who want to reinterpret a 184-year-old treaty signed between the British and Indigenous Maori.