The 1920s saw the introduction of Protestantism to Bougainville, in the form of missionaries from the Methodist Church of New Zealand (1921) and the Seventh-day Adventist Church (1924). Tensions arose between the existing Catholic missionaries and the new arrivals, culminating in sectarian disturbances in Kieta in 1929. Father Albert Binois wrote to his superiors that the Protestants were "friends of the devil". The late 1920s and 1930s also produced an influx of anthropologists and ethnographers to Bougainville, among them Australians Ernest and Sarah Chinnery, Catholic priest Patrick O'Reilly, Briton Beatrice Blackwood, and American Douglas L. Oliver.