What is Section 8 housing? How do I report fraud?

My next door neighbor is a house renter who is committing Section 8 housing subsidy fraud. Also, this possibly includes welfare fraud as well, since nearly all Section 8 housing recipients are also receiving welfare benefits. I live in California. How do I report this and to whom? It saddens me to know some families legitimately need government assistance to keep a roof over their children’s heads and my neighbors and horribly misusing a system that I am told has a very long waiting list.
As a taxpayer, I refuse to simply "look the other way" and allow this abuse to go unreported. Please help! Any advice or info would be highly appreciated.

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