Concentration camp

Concentration camps, sometimes referred to as labour camps (TV: Turn Left) or death camps, (TV: The Middle Men) were facilities used by the Nazis to dispose of what they considered to be undesirables in World War II. The Seventh Doctor said this included Jews, homosexuals, Gypsies and trade unionists — "anyone a bit different, anyone they don't like the look of." (PROSE: Timewyrm: Exodus) According to Jason Kane, the prisoners were used as slave labour, expected to survive with only scraps of food and clothing. (AUDIO: Just War) Most died. (PROSE: Timewyrm: Exodus)

In 1903, after receiving a wealth of information from the future, Grigori Rasputin foresaw the Holocaust. (AUDIO: The Wanderer)

In May 1940, a submarine carrying Zyklon B gas to a concentration camp was attacked by a Nemonite. (AUDIO: The Nemonite Invasion)

Fitz Kreiner's uncle, Jürgen Kreiner, was among those sent to concentration camps during World War II. As a result of his internment, Jürgen's arms bore the marks of a serial number, the meaning of which Otto Kreiner was reluctant to explain to his young son, Fitz. (PROSE: Frontier Worlds)

In the aftermath of Miracle Day in 2011, in which people ceased to die, people were taken to overflow camps. Category ones, people who would have died had it not been for Miracle Day, were taken to Modules and incinerated. (TV: The Categories of Life) Gwen Cooper compared these camps to concentration camps. (TV: The Middle Men)

Alternate timelines
In another alternative timeline accidentally created by the Seventh Doctor and Ace's arrival in Colditz Castle in October 1944, an alternative version of the Eighth Doctor who used the name "Johann Schmidt" disrupted the Nazi's "ethnic cleansing programmes" between 1955 and 1965. Consequently, he attracted the attention of the Nazi authorities but nevertheless maintained his liberty. (AUDIO: Klein's Story)

In a parallel world, in the aftermath of the destruction of London, among other disasters caused by aliens, foreigners in Britain were taken to labour camps in 2009, as other countries closed off their borders. Upon hearing this, Wilfred Mott exclaimed, "That's what they called them last time!" (TV: Turn Left)