Notable Viet Cong atrocities include the massacre of over 3,000 unarmed civilians at Huế during the Tet Offensive and the killing of 252 civilians during the Đắk Sơn massacre . 155,000 refugees fleeing the final North Vietnamese Spring Offensive were reported to have been killed or abducted on the road to Tuy Hòa in 1975 . According to Rummel , North Vietnamese and Viet Cong troops killed 164,000 civilians in democide between 1954 and 1975 in South Vietnam , from a range of between 106,000 and 227,000 ( 50,000 of which were reportedly killed by shelling and mortar on ARVN forces during the retreat to Tuy Hoa ) . North Vietnam was also known for its abusive treatment of American POWs , most notably in Hỏa Lò Prison ( aka the '' Hanoi Hilton '' ) , where torture was employed to extract confessions
Đắk Sơn massacre
Đắk Sơn massacre
Vietnam War