If you have ever been to Berlin and taken the train out to Orienenburg, walk down the road turn right and then after 150 yards tuen left along a very nice road full of pre-war houses you come to Sachenhausen KL memorial site with the T Building on the right hand side. Then there is the Topography of Terrors memorial on what was Prinz Albrectstrasse 8.
Then there is the Stasi prison at Hohenschönhausen in the Berlin suburbs. I have visited bth recently and both make sobering experiences. Later this week I will be in Jersey and will visit the Underground Hospital there. Strangely the dmensions of the wards are the same dimensions as the gas chambers at Auschitz Birkenau with a lot of the same facilities.
People who throw the term nazi or communit round, really do need to get a grip and read and visit some places in this world.