http://www.thedailybeast.com/articles/2015/10/31/the-best-co...
Or the boiler rooms & microcap fraud in the 1980s/1990s:
https://en.wikipedia.org/wiki/Microcap_stock_fraud
And yep, it was still happening even before the accredited investor criteria was relaxed;
https://www.justice.gov/usao-sdfl/pr/five-defendants-charged...