Labaton Sucharow has petitioned an appeals court to remove a federal judge in Boston whose questions about possible public corruption in a securities class action case, according to the firm, have raised concerns about his impartiality.

In a July 10 petition for writ of mandamus, Labaton asked the U.S. Court of Appeals for the First Circuit to vacate U.S. District Judge Mark Wolf’s order last month refusing to recuse himself from the case against State Street Corp. The New York firm is objecting to a special master’s report that found Labaton and two other firms serving as class counsel in the case had deliberately misled the court about how they planned to distribute $75 million in attorney fees.