3 Grassley called on the ATF to hold those who retaliated against the whistleblower accountable. In June 2022, the FBI investigated allegations that an ATF special agent “made threats against Mr. Siwajuola and another ATF whistleblower” for disclosing the misclassification scheme. Negative performance reviews followed, as well as “isolation by his colleagues and management” – all part of the “persistent retaliation against” Siwajuola, Grassley wrote. Matthew Symons for NY PostSiwajuola told Grassley he was asked “inappropriate questions about his National Origin and to uncover his political beliefs,” during an Aug. 27 interview related to the probe. “Biden ATF management put pressure on Mr. Siwajuola and others to approve certain applicants, especially applicants with relationships with past or current ATF employees,” Grassley claimed, citing the whistleblower’s disclosures.