After the failure of the Beer Hall Putsch in 1923, and his subsequent trial and imprisonment, Hitler decided that the way for the Nazi Party to achieve power was not through insurrection, but through legal and quasi-legal means. This did not sit well with the brown-shirted stormtroopers of the SA, especially those in Berlin, who chafed under the restrictions that Hitler placed on them, and their subordination to the party. This resulted in the Stennes Revolt of 1930-31, after which Hitler made himself the Supreme Commander of the SA, and brought Ernst Röhm back to be their Chief of Staff and keep them in line. The quashing of the SA's revolutionary fervor convinced many businessmen and military leaders that the Nazis had put aside their insurrectionist past, and that Hitler could be a reliable partner 
Some of the most notorious slave labour camps included a network of subcamps. Gross-Rosen had 100 subcamps, Auschwitz had 44 subcamps, Stutthof had 40 sub-camps set up contingently. Prisoners in these subcamps were dying from starvation, untreated disease and summary executions by the tens of thousands already since the beginning of war.
Though most Nazi concentration and extermination camps were destroyed after the war, some of them were turned into permanent memorials, and museums. In Communist Poland, some camps such as Majdanek, Jaworzno, Potulice and Zgoda were used by the Soviet NKVD to hold German prisoners of war, suspected or confirmed Nazis and Nazi collaborators, anti-Communists and other political prisoners, as well as civilian members of the German-speaking, Silesian and Ukrainian ethnic minorities. Currently, there are memorials to the victims of both Nazi and communist camps at Potulice; they have helped to enable a German-Polish discussion on historical perceptions of World War II. In East Germany, the concentration camps at Buchenwald and Sachsenhausen were used for similar purposes. Dachau concentration camp was used as a detention centre for the arrested Nazis.
On the two occasions I have returned to Auschwitz, in 1995 and 2011, although I haven’t got memories as such of the time I spent there, something is triggered deep inside me, both physically and in my inner being. I get very nervous and the death, the cold, the expanse and the emptiness of it swamps me – it’s a feeling that it’s hard to explain but it’s everywhere. I can feel the burnt earth everywhere I walk.
In 1920, the Nazi Party officially announced that only persons of "pure Aryan descent [rein arischer Abkunft]" could become party members and if the person had a spouse, the spouse also had to be a "racially pure" Aryan. Party members could not be related either directly or indirectly to a so-called "non-Aryan". Even before it had become legally forbidden by the Nuremberg Laws in 1935, the Nazis banned sexual relations and marriages between party members and Jews. Party members found guilty of Rassenschande ("racial defilement") were persecuted heavily, some members were even sentenced to death.
Eventually, Birkenau held the majority of prisoners in the Auschwitz complex, including Jews, Poles, Germans, and Gypsies. Furthermore, it maintained the most degrading and inhumane conditions–inclusive of the complex’s gas chambers and crematoria. A third section, Auschwitz III, was constructed in nearby Monowitz, and consisted of a forced labor camp called Buna-Monowitz.
Things continued to get worse. The Germans began to require all Jewish people to wear yellow stars on their clothing. Some Jews were rounded up and taken to concentration camps. Then one day the order came that Margot would have to go to a labor camp. Otto was not going to let that happen. He and Edith had been preparing a place for the family to hide. The girls were told to pack up what they could. They had to wear all their clothes in layers because a suitcase would look too suspicious. Then they went to their hiding place.
Auschwitz didn’t long remain a camp exclusively for Poles. In June 1941, Germany launched a surprise invasion of the Soviet Union, taking three million prisoners over the next seven months. Many were starved to death. Others were sent to occupied Poland or Germany as slave laborers. In the fall of 1941, ten thousand prisoners of war arrived at Auschwitz and began building the Birkenau camp.
After Kristallnacht (the ‘Night of broken glass’) in November 1938, the Nazis and their supporters arrested many thousands of male Jews above the age of 14 years. They imprisoned them in camps for days or sometimes weeks. They were kept in poor conditions, given little food or water and subjected to brutal treatment and torture. When the German army invaded Poland on 1 September 1939, the SS set up many concentration camps to house Polish political prisoners and many thousands of Polish Jews. Many of the inmates of these camps were subjected to increasingly poor conditions. In addition they were subjected to forced labour, the result of which was often death.
In 1938, Otto Frank started a second company, Pectacon, which was a wholesaler of herbs, pickling salts, and mixed spices, used in the production of sausages. Hermann van Pels was employed by Pectacon as an advisor about spices. A Jewish butcher, he had fled Osnabrück with his family. In 1939, Edith Frank's mother came to live with the Franks, and remained with them until her death in January 1942.
It was founded as the German Workers’ Party by Anton Drexler, a Munich locksmith, in 1919. Hitler attended one of its meetings that year, and before long his energy and oratorical skills would enable him to take over the party, which was renamed National Socialist German Workers’ Party in 1920. That year Hitler also formulated a 25-point program that became the permanent basis for the party. The program called for German abandonment of the Treaty of Versailles and for the expansion of German territory. These appeals for national aggrandizement were accompanied by a strident anti-Semitic rhetoric. The party’s socialist orientation was basically a demagogic gambit designed to attract support from the working class. By 1921 Hitler had ousted the party’s other leaders and taken over.
Nazi, the informal and originally derogatory term for a party member, abbreviates the party's name (Nationalsozialist German pronunciation: [natsi̯oˈnaːlzotsi̯aˌlɪst]), and was coined in analogy with Sozi (pronounced [ˈzoːtsiː]), an abbreviation of Sozialdemokrat (member of the rival Social Democratic Party of Germany). Members of the party referred to themselves as Nationalsozialisten (National Socialists), rarely as Nazis. The term Parteigenosse (party member) was commonly used among Nazis, with its corresponding feminine form Parteigenossin.
As the German leader (Führer) of Nazi Germany, Hitler began moving Nazi armies into neighboring countries. When Germany attacked Poland, World War II started. Western countries like France, Belgium, and the Netherlands were occupied and to be treated by Germany as colonies. However, in Eastern countries, such as Poland and the Soviet Union, the Nazis planned to kill or enslave the Slavic peoples, so that German settlers could take their land.
Between 1933 and the fall of Nazi Germany in 1945, more than 3.5 million Germans were forced to spend time in concentration camps and prisons for political reasons, and approximately 77,000 Germans were executed for one or another form of resistance by Special Courts, courts-martial, and the civil justice system. Many of these Germans had served in government, the military, or in civil positions, which enabled them to engage in subversion and conspiracy against the Nazis.