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Google "swastika" and you'll see it's been around since long before the NAZI's.

The Swastika -- a Sanskrit word -- manifests in cultures throughout the world, but most visibly festoons many a public surface in Asia, from Pakistan to Vietnam. An icon of significance to both Hindus and its derivative Buddhists, it is often associated with Ganesha, the elephant-headed god of prosperity.

I've seen those in Glendale but doubt its anything more than coincidental to the height of teen white-supremacist gangs there in the 70s and 80s. Would be interesting to find out what the back story is.

Those light poles in Glendale were erected in the 1920's, before it was used as a symbol on the Nazi party in Germany. See the following report from the City of Glendale regarding the history behind the light poles:

http://www.ci.glendale.ca.us/lampposts.asp