Self Regulatory Organizations Always Police Their Industries Well

Well of course that's not true.  None of them do, from the FCC to the SEC.  But some do a better job than others.
FINRA (the Financial Industry Regulatory Authority) seems to do a fair job considering their financial and political constrictions, as you can see below.  But out of 637,000+ brokers, they only examined 4500.  Or about 7/10 of one percent.  More instructional is the cases of theft and deception committed by specific brokers.  They're instructional because they all could have been prevented by more aware investors.
I invite you to explore their website at finra.org



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