How a group of investors wronged by Bay Area real estate mogul became ‘God’s answer to our own prayers’

Four days after a hearing in the criminal case of Ken Mattson, who has been accused by federal prosecutors of wire fraud, money laundering and obstruction of justice, 13 of the investors he wronged were discussing how their lives have been affected by their association with the indicted Sonoma real estate investment advisor.

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Despite Mattson’s convincing promises of a retirement free from financial worry...