I don't know the law that well. but it's normal to see punks antifa with this on their back http://1.bp.blogspot.com/_O2iB5xy9Vio/SUPKED-_xpI/AAAAAAAAACE/wthZTXBnbu8/S220/Anti-Nazi.gif Here's a small resume, more details in the german page: http://en.wikipedia.org/wiki/Swastika#Germany. according to the article, even the law was a bit dumb, until they eventually got it right

as soon as they hear your accent, don't know if they'll be that wasted. they look quite awake here http://www.youtube.com/watch?v=EqP4ZQGqi7M&feature=related (this is from 2006)

last year, just 10m walk from here, a guy was beaten down in the subway, in the centre of berlin. http://www.trend.infopartisan.net/trd7809/t497809.html (first news).

fortunately everytime they try a nazi demonstration, there's a antidemo with 100x more people.