In the 1920s and 30s, the NSDAP also grew and prospered in Tyrol. The first local branch of the NSDAP in Innsbruck was founded in 1923. With "Der Nationalsozialist - Combat Gazette for Tyrol and Vorarlberg" published its own weekly newspaper. In 1933, the NSDAP also experienced a meteoric rise in Innsbruck. The general dissatisfaction and disenchantment with politics among the citizens and theatrically staged torchlight processions through the city, including swastika-shaped bonfires on the Nordkette mountain range during the election campaign, helped the party to make huge gains. Over 1800 Innsbruck residents were members of the SA, which had its headquarters at Bürgerstraße 10. While the National Socialists were only able to win 2.8% of the vote in their first municipal council election in 1921, this figure had already risen to 41% by the 1933 elections. Nine mandataries, including the later mayor Egon Denz and the Gauleiter of Tyrol Franz Hofer, were elected to the municipal council. It was not only Hitler's election as Reich Chancellor in Germany, but also campaigns and manifestations in Innsbruck that helped the party, which had been banned in Austria since 1934, to achieve this result. As everywhere else, it was mainly young people in Innsbruck who were enthusiastic about National Socialism. They were attracted by the new, the clearing away of old hierarchies and structures such as the Catholic Church, the upheaval and the unprecedented style. National Socialism was particularly popular among the big German-minded lads in the student fraternities and often also among professors.

When the annexation of Austria to Germany took place in March 1938, civil war-like scenes ensued. Already in the run-up to the invasion, there had been repeated marches and rallies by the National Socialists after the ban on the party had been lifted. Even before Federal Chancellor Schuschnigg gave his last speech to the people before handing over power to the National Socialists with the words "God bless Austria" had closed on 11 March 1938, the National Socialists were already gathering in the city centre to celebrate the invasion of the German troops. The police of the corporative state were partly sympathetic to the riots of the organised manifestations and partly powerless in the face of the goings-on. Although the Landhaus and Maria-Theresien-Straße were cordoned off and secured with machine-gun posts, there was no question of any crackdown by the executive. "One people - one empire - one leader" echoed through the city. The threat of the German military and the deployment of SA troops dispelled the last doubts. More and more of the enthusiastic population joined in. At the Tiroler Landhaus, then still in Maria-Theresienstraße, and at the provisional headquarters of the National Socialists in the Gasthaus Old Innspruggthe swastika flag was hoisted.

On 12 March, the people of Innsbruck gave the German military a frenetic welcome. On 5 April, Adolf Hitler visited Innsbruck in person to be celebrated by the crowd. Archive photos show a euphoric crowd awaiting the Führer, the promise of salvation. Mountain fires in the shape of swastikas were lit on the Nordkette. The referendum on 10 April resulted in a vote of over 99% in favour of Austria's annexation to Germany. After the economic hardship of the interwar period, the economic crisis and the governments under Dollfuß and Schuschnigg, people were tired and wanted change. What kind of change was initially less important than the change itself. "Showing them up there", that was Hitler's promise. The Wehrmacht and industry offered young people a perspective, even those who had little to do with the ideology of National Socialism in and of itself. The fact that there were repeated outbreaks of violence was not unusual for the interwar period in Austria anyway. Unlike today, democracy was not something that anyone could have got used to in the short period between the monarchy in 1918 and the elimination of parliament under Dollfuß in 1933, which was characterised by political extremes. There is no need to abolish something that does not actually exist in the minds of the population.

Tyrol and Vorarlberg were combined into a Reichsgau with Innsbruck as its capital. There was no armed resistance, as the left in Tyrol was not strong enough. There were isolated instances of unorganised subversive behaviour by the Catholic population, especially in some rural communities around Innsbruck. Even though National Socialism was viewed sceptically by a large part of the population, there was hardly any organised resistance. The apparatus of power dominated people's everyday lives too comprehensively. Many jobs and other comforts of life were tied to an at least outwardly loyal attitude to the party. The majority of the population was spared imprisonment, but the fear of it was omnipresent.

The regime under Hofer and Gestapo chief Werner Hilliges also did a great job of suppression. In Tyrol, the church was the biggest obstacle. During National Socialism, the Catholic Church was systematically combated. Catholic schools were converted, youth organisations and associations were banned, monasteries were closed, religious education was abolished and a church tax was introduced. Particularly stubborn priests such as Otto Neururer were sent to concentration camps. Local politicians such as the later Innsbruck mayors Anton Melzer and Franz Greiter also had to flee or were arrested. To summarise the violence and crimes committed against the Jewish population, the clergy, political suspects, civilians and prisoners of war would go beyond the scope of this book.

The Gestapo headquarters were located at Herrengasse 1, where suspects were severely abused and sometimes beaten to death with fists. In 1941, the Reichenau labour camp was set up in Rossau near the Innsbruck building yard. Suspects of all kinds were kept here for forced labour in shabby barracks. Over 130 people died in this camp consisting of 20 barracks due to illness, the poor conditions, labour accidents or executions.

Prisoners were also forced to work at the Messerschmitt factory in the village of Kematen, 10 kilometres from Innsbruck. These included political prisoners, Russian prisoners of war and Jews. The forced labour included, among other things, the construction of the South Tyrolean settlements in the final phase or the tunnels to protect against air raids in the south of Innsbruck. In the Innsbruck clinic, disabled people and those deemed unacceptable by the system, such as homosexuals, were forcibly sterilised.

The memorials to the National Socialist era are few and far between. The Tiroler Landhaus with the Liberation Monument and the building of the Old University are the two most striking memorials. The forecourt of the university and a small column at the southern entrance to the hospital were also designed to commemorate what was probably the darkest chapter in Austria's history.