While Pentecostals shared many basic assumptions with conservative Protestants, the earliest Pentecostals were rejected by Fundamentalist Christians who adhered to cessationism. In 1928, the World Christian Fundamentals Association labeled Pentecostalism "fanatical" and "unscriptural". By the early 1940s, this rejection of Pentecostals was giving way to a new cooperation between them and leaders of the "new evangelicalism", and American Pentecostals were involved in the founding of the 1942 National Association of Evangelicals. Pentecostal denominations also began to interact with each other both on national levels and international levels through the Pentecostal World Fellowship, which was founded in 1947.