So 20 percent of German youth are Neo-Nazis?

OK so I would provide a link but I can't find the website I was on when I came upon this. Isn't illegal to show a swastika in Germany? If so how are they getting away with it? How do they grow so much? Wouldn't think the German government would crack down on this considering the government consider themself a islamic republic? That statistic shocked me to the core. If they come to power....WW3 anybody?