Internal Revenue Service (IRS) whistleblowers Gary Shapley and Joseph Ziegler filed a massive defamation lawsuit against Hunter Biden’s attorney on Friday. Shapley and Ziegler, both IRS agents, alleged to Congress that officials in President Joe Biden’s Department of Justice (DOJ) gave Hunter Biden preferential treatment during an investigation into his taxes and overseas business dealings in testimony delivered in May and June 2023. Read: Harris Adopted Economic Policy That Experts Worry Could Harm Tipped Workers The two IRS whistleblowers, who also provided other information about Hunter Bid…