The Department of Justice is conducting a grand jury probe after the monitor’s most recent review said Shawn Fain retaliated against Rich Boyer and misused his authority to benefit his fiancée.Neil Barofsky, who leads the monitor’s office, notified both men last month and deferred disciplinary steps while the DOJ reviews material from the monitor and other reports, according to internal documents and court filings.Mr. Fain denies the allegations as "bogus," is seeking a second four-year term, and his lawyers are preparing legal challenges as the union—under federal oversight since a corruption settlement—contends with intensified internal divisions.