Financial Advisers Gone Wrong (Bernie Madoff)

Swindling, lying, scheming, disingenuous securities salesmen...(Bernie Madoff and his Associates)

adjective
not candid or sincere, typically by pretending that one knows less about something than one really does.

synonyms: insincere, dishonest, untruthful, false, deceitful, duplicitous, lying, mendacious; hypocritical
"that innocent, teary-eyed look is just part of a disingenuous act"