The Massachusetts pension board withheld a $75 million investment from Fidelity Investments on Monday, expressing doubts and concerns over how the mutual fund giant has responded to the government's investigation of its traders' improper trading practices, the Boston Globe reports.

While Fidelity has not been charged with any wrongdoing, regulators investigating the case are trying to determine if Fidelity traders gave more business to brokers who showered them with gifts and entertainment rather than to those brokers who offered the best prices on trades.

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