IRS, a debt collecting arm of the Federal Reserve (private corp) and can't even prosecute their own cases, must have DoJ do it for them, has been weaponized far too long in too many admins since 1913. FDR being one of them effectively against his opponents such as Huey Long of Louisiana.
https://www.hillsdale.edu/educational-outreach/free-market-forum/2006-archive/fdr-and-the-irs/
https://www.americanlibertyreport.com/articles/democrats-using-the-fbi-to-spy-on-political-opponents-for-80-years/