1 Ginny: {stopped at a junction in the labyrinth} A three way fork. I say we go left.
1 Monty: No, middle.
2 Minnesota Jones: I'm with the boy. Middle.
2 Prof. Jones: I vote middle too.
3 Haken: This is not a democracy! We go to die extreme right! {walks decisively into the right passageway}
4 Erwin: I fear that will come back to haunt Nazi Germany one day...

Nazism is generally considered to be part of the spectrum of far right wing political systems.

The word Nazi is an abbreviation of the German Nationalsozialist, because when the Nazi Party was established around 1920 it was based on socialist principles dedicated to empowering workers. Socialism is normally seen as part of the left wing of politics, but over time the Nazi policies evolved towards fascism, which is an extreme right-wing political philosophy.

By the time the Nazis ruled Germany and waged terrible war on the world, they were essentially a subset of a greater fascist movement which also included Benito Mussolini's Italy. Thus, despite their beginnings, most people now consider Nazism to be an extreme right-wing philosophy.

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2014-04-07 Rerun commentary: You can see in the second panel that the wall containing the three doorways doesn't actually extend much above the doorways. Behind it is the usual trick of a LEGO baseplate standing on its side to give a high wall of LEGO material. Often walls were never as high as I would have liked them to be, either through lack of enough matching LEGO bricks, or simply not wanting to spend an inordinate amount of time building, taking apart, and rebuilding walls.

You'll notice in this comic there is also a subtle (or not-so-subtle, depending on whether you noticed it or not) joke in that Ginny wants to take the left passage. I didn't mention above that Communists (which Ginny might believably be, given we know at this point that she is a Russian agent) are traditionally seen as being the extreme left side of the political spectrum.