The head of the National Association of Realtors abruptly resigned. She says she faced a blackmail threat.

The head of the National Association of Realtors abruptly resigned. She says she faced a blackmail threat.

The Chicago-based organization said Monday that NAR president Tracy Kasper has resigned, effective immediately, and is being succeeded by the trade group's president-elect, Kevin Sears.RichLegg/Getty… [+2512 chars]

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