Washington — Arguably the last thing new US treasury secretary Janet Yellen wants to take up during her first days in office is a financial market imbroglio involving one of her last private sector business relationships.

But as hedge fund Citadel emerges as one of the key actors in the trading frenzy last week involving GameStop — and questions arise over whether the activity exposes deeper risks for the financial system — Yellen could find herself pulled into the fray...

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