Question: South Vietnamese were executed in which amount?
About the article "Vietnam", section "1976–present: reunification and reforms".

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 1960 South Vietnamese coup attempt 1962 South Vietnamese Independence Palace bombing 1963 South Vietnamese coup  
The Battle of Hill 723 was a Vietnam War battle in the country of Laos, which was fought between the South Vietnamese Army and the Communist North Vietnamese Army (NVA).
It took place from March 7 to March 16, 1971, during the South Vietnamese invasion of Laos.
The result was a North Vietnamese Army victory.
As the South Vietnamese Army approached Hill 723, moving along Route 9 on March 7, 1971, the North Vietnamese Army artillery opened fire and quickly pinned down the advancing South Vietnamese troops.
The South Vietnamese Army (ARVN)’s 1st Infantry Division was trapped as the northern flank was closed and the main column was cut off.
To no avail, the South Vietnamese High Command attempted to reinforce the 1st Infantry Division with the 2nd and 3rd Regiments.
The result was that the South Vietnamese forces were almost completely annihilated. 
 October 15, 1964 October.
Nguyễn Văn Trỗi was executed on October 15, 1964.
A Vietnamese electrical worker and Viet Cong (National Liberation Front) urban guerrilla.
He became known after being captured by the South Vietnamese when trying to assassinate United States Secretary of Defense Robert McNamara and future ambassador Henry Cabot Lodge, Jr. who were visiting South Vietnam in May 1963. 
Military Effect.
The South Vietnamese army in Phuoc Long, under the command of Lieutenant General Du Quoc Dong, used everything they had at their disposal in order to stop the North Vietnamese onslaught.
In their efforts to save Phuoc Long and other territories around the district, the South Vietnamese lost more than a thousand soldiers killed in action and 2,444 others were captured.
The sacrifice of South Vietnamese soldiers in the battle was exemplified by the 250-men 81st Airborne Ranger Battalion, which lost more than 150 soldiers in their last-ditch effort to save Phuoc Long.
In the end, about 850 South Vietnamese soldiers were evacuated from the battlefield.
In comparison to their South Vietnamese counterparts, the casualties suffered by the North Vietnamese 4th Army Corps were relatively light with about 1,300 killed or wounded.
In logistical terms the victory at Phuoc Long enabled the North Vietnamese to connect their supply lines from the Ho Chi Minh Trail, with bases in the Central Highlands and the Mekong Delta.
At the same time, with a strengthened supply line which stretched from the north to the southern provinces of South Vietnam, regular units of the North Vietnamese army were able to apply additional pressure on the weakened South Vietnamese army already starved of American supplies. 
R. J. Rummel estimated that NVA/VC forces killed around 164,000 civilians in democide between 1954 and 1975 in South Vietnam, from a range of between 106,000 and 227,000.
Rummel's summary has a mid-level estimate of 17,000 South Vietnamese civil servants (ARVN's local millitia) killed by North Vietnamese forces (including the Viet Cong).
In addition, at least 36,000 Southern civilians were executed for various reasons in the period 1967–1972.
About 130 American and 16,000 South Vietnamese POWs died in captivity.
During the peak war years, almost a third of civilian deaths were the result of Viet Cong atrocities.