Yes and it can and has happened again even to the point of state sponsored and organized death camps.
Country/Year Hidden Holocausts
Belgian Congo 1891-1911 11,500,000 blacks died 1891-1911; from 1907 Kongo was a Belgian Crown Domain.
South Africa, 1900 In the Boer-war the British coined the word "concentration camp".
Armenia, 1915 1,500,000 Christian Armenians killed by Turks in what Churchill called a Holocaust.
USSR, 1921 21,000,000 hit by partly Soviet-engineered famine. (2nd August 1921)
Ukraine, 1932-1933 4,821,600 died of hunger engineered by Stalin 1932-33. 7,465,000 died in 1932-1939.
USSR 1934 to 1953 From 1934 to 1953 upto 15 million Russians disappered in the GULAGS.
Germany/Poland 1939-1945 5,000,000 non-jews died in Germancamps, mainly Polish Christians and Catholics
Germany, 1942-1945 5,860 mill. jews died in German KZ-Camps
Poland/Russia from 1941 1,700,000 Polish people were deported to Siberia after 1941.
Bengal, 1943 1,500,000 died of war-related famine in 1943 in Bengal.
Germany, East Prussia 1945 upto 3,000,000 German civilians were killed by Russians in the last months of WW2.
Cambodia, 1975-1979 Khmer Rouge´s Pol Pot (president 1976) killed abt. 1,700,000 of his own people.
East Timor 1983-1985 200,000 East Timorese (Indonesia) were killed in 1983-1985.
Rwanda/Burundi - 1993-1994 700,000 Hutus and Tutsies murdered each other while the world looked away.
Yugoslavia 1991-2000 About 250,000 dead Yugoslaws can be blamed on Milosevic upto 2000.
GREATEST CRIMINALS OF THE 20TH CENTURY
Stalin, Josef W. Probably the biggest killer of all with a total of upto 62 million 1932-1953.
Adolf Hitler Hitlers 2rd place because the industrial killing only took place in 1942-45.
Mao ZeDong Possibly no. 3 killer with a total of upto 35 million that can attributed Mao.
Pol-Pot Possibly the most extreme, killing 1,700,000 out of the population of Cambodia.
Lenin, Wladimir Illitsch In his writings the most bloodthirsty, laying the foundation of Stalin´s terror.
Suharto Killed 700,000 Communists in 1965 and 200,000 Eastern Timorese in 1983-1985.
Milosevic About 250,000 dead Yugoslaws can be blamed on Milosevic.
Deadliest wars since WW2 with totals of military and civil casualties: Korea 3,000,000 - Vietnam 2,059,000 - Nigeria 2,000,0
Source:
http://users.cybercity.dk/~dko12530/holocausts.htm