that peoples are entitled to determine their own future and that it will not join in any arrangement which would hinder this". U.S. President Dwight D. Eisenhower wrote in 1954: In 1957, independent observers from India, Poland, and Canada representing the International Control Commission (ICC) stated that fair, unbiased elections were not possible, with the ICC reporting that neither South nor North Vietnam had honored the armistice agreement. From April to June 1955, Diệm eliminated any political opposition in the south by launching military operations against two religious groups: the Cao Đài and Hòa Hảo of Ba Cụt. The campaign also focused on the Bình Xuyên organized crime group, which was allied with members of the communist party secret police and had some military elements. The group was ultimately defeated in April following a battle in Saigon. As broad-based opposition to his harsh tactics mounted, Diệm increasingly sought to blame the communists. In a referendum on the future of the State of Vietnam on 23 October 1955, Diệm rigged the poll supervised by his brother Ngô Đình Nhu and was credited with 98.2 percent of the vote, including 133% in Saigon. His American advisors had recommended a more "modest" winning margin of "60 to 70 percent." Diệm, however, viewed the election as a test of authority. Three days later, he declared South Vietnam to be an independent state under the name Republic of Vietnam (ROV), with himself as president. Likewise, Ho Chi Minh and other communist officials always won at least 99% of the vote in North Vietnamese "elections". The domino theory, which argued that if one country fell to communism, then all of the surrounding countries would follow, was first proposed as policy by the Eisenhower administration. John F. Kennedy, then a U.S. senator, said in a speech to the American Friends of Vietnam: "Burma, Thailand, India, Japan, the Philippines and obviously Laos and Cambodia are among those whose security would be threatened if the Red Tide of Communism overflowed into Vietnam." Diệm era, 1954–1963 Rule A devout Roman Catholic, Diệm was fervently anti-communist, nationalist, and socially conservative. Historian Luu Doan Huynh notes that "Diệm represented narrow and extremist nationalism coupled with autocracy and nepotism." Most Vietnamese people were Buddhist, and they were alarmed by Diệm's actions, like his dedication of the country to the Virgin Mary. Beginning in the summer of 1955, Diệm launched the "Denounce the Communists"