Shawn Fain, the president of the United Auto Workers, is under investigation by an independent federal monitor for alleged retaliation against other union leaders. What Happened: The investigation, initiated by monitor Neil Barofsky in February, is examining claims of retaliation against UAW Secretary-Treasurer Margaret Mock for her refusal to authorize certain expenses for Fain’s office, reported Reuters. Fain said that he encouraged the monitor “to investigate whatever claims are brought to their office, because we know what they’ll find: a UAW leadership committed to serving the membership,…