He held positions of SS and Police Leader in occupied Poland and the Soviet Union, and was indicted for war crimes including the killing of at least 4,247 Poles by units under his command.

Alvensleben left the SA in 1932; at that time he was heavily indebted and had a considerable criminal record on charges which included libel and road traffic offence.

Alvensleben's career continued after the 1939 Invasion of Poland as commander of the Volksdeutscher Selbstschutz ('German Self-Defense') organization in what was to become the newly established Reichsgau Danzig-West Prussia.

[2][3]The Selbstschutz paramilitary forces, formed by members of the German minority in Poland and led by SS officials, performed mass executions during the Intelligenzaktion Pommern in the "Fordon Valley of Death", the Massacres in Piaśnica,[4] and other atrocities.

From February 1941 he was in service of the Reich Security Main Office, assumed the SS and Police Leader command in Chernigov on 22 October 1941 and of Simferopol in Crimea on 19 November.

In 1942, Alvensleben was SS inspector of the Durchgangsstrasse IV, a large forced labor project to build a road from Lemberg to Stalino (now Donetsk).

[6] From 6 October 1943, he held this position in Nikolaev in the rank of Major General, officially assigned to Army Group A; his tenure was accompanied by irregularities and further mass executions.

He took the occasion to take action against his creditors, such as Carl Wentzel who was denounced after the 20 July plot, arrested and executed, whereafter Alvensleben was able to release his heavily indebted manor in Schochwitz.

Although there is no precise data on when they arrived in the country, according to a 2000 documentary film, the government of Juan Perón granted Alvensleben citizenship under the name of Carlos Lücke on 27 November 1952.