Activist investor Joseph Stilwell has stepped up his campaign to oust the chief executive at First Financial Northwest (FFNW) in Renton, Wash.

Stilwell disclosed in a Securities and Exchange Commission filing Friday that he has filed a lawsuit against the $1 billion-asset First Financial seeking to invalidate the results of the company's recent board elections in which the CEO, Victor Karpiak, defeated Stilwell's nominee, Spencer Schneider.

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