As the Māori nationalist movement grew in New Zealand in the late 1960s and 1970s, Iti became involved. He protested against the Vietnam War and apartheid in South Africa, and he became involved with Nga Tamatoa, a major Māori protest group of the 1970s, from its early days. He joined the Communist Party of New Zealand, and went to China in 1973 during the cultural revolution. He has taken part in a number of land occupations and held a "hikoi" to the New Zealand Parliament.