regarding mail were strictly enforced. Most of the time,
prisoners at Sachsenhausen were allowed to receive two
letters or two cards per month. This was reduced to one card
or one letter during 1941, when the SS guards were busy
executing about 15,000 captured Red Army prisoners, and then
restored to two per month in 1942 and later.
September 2, 1942, letter addressed to a Czech prisoner at
Sachsenhausen was rejected and returned to sender, because
he had received his monthly quota before it arrived. The
handstamped marking on the back states, "Already received
mail." An October 4, 1940, letter from Vienna was opened and
examined by the Sachsenhausen censor, rejected and stapled,
and returned to the sender. The marking on the back states,
"Does not obey camp regulations."