In an address to Congress, President Harry Truman states that the foreign policy of the United States is to assist any country whose stability is threatened by communism. The policy becomes known as the Truman Doctrine
You man are called the Viet Cong.
Diem had consolidated his power and control over South Vietnam. He also launched many political repression and anti-communist campaigns across the country
When the gruelling First Indochina War ended, in 1954, it was agreed that the country should be temporarily partitioned until 1956 when democratic elections would determine the future of a united Vietnam.
Meanwhile, Ho’s government formed a guerilla movement, commonly known as the Viet Cong, to infiltrate South Vietnam and foment an uprising.