Aheem no! Don't know where that's from, still it's completely false. It's correct some police men/women are connected publicly to facism- this has nothing to do with their reaction to said rallies though, but with police intern what's app chat groups that hail 3: Reich and advocate violence against persons of non-European heritage. You should, at least, try to get your facts about Germany straight, when talking about it, since a few people on this forum are livin' in Germany and may refute you without any problems, otherwise.
Edt: Here are a few links to support, what I wrote- in German, dstill google translate might do its job.
http://www.hessenschau.de/politik/67-rechte-chatgruppen-bei-hessischer-polizei---zum-teil-mit-kinderpornografie,polizei-rechte-chatgruppen-kinderpornografie-innenausschuss-100.html
http://www.fr.de/politik/poliei-hessen-rechtextremer-chat-darmstadt-praesidium-news-91467623.html