He also uncovered records showing that Mr. Spier was accused, but never convicted, of extortion and attempted larceny.

WSJ: When a Genealogy Hobby Digs Up Unwanted Secrets

By Mohnish Pabrai, managing partner of Pabrai Investment Funds, and Guy Spier, managing principal of Zurich-based Aquamarine Funds.

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Michael Auret, managing director of South African production firm Spier Films, says the incentives have already made a big difference.

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According to newspaper accounts, Mr. Spier was arrested after a wild police chase and a police-station confrontation with both wives, says Mr. Arons.

WSJ: When a Genealogy Hobby Digs Up Unwanted Secrets