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Home > About IRS    About IRS   Criminal Investigation (CI) Publications   The Facts About Trusts - Publication 2193   ( html version of Pub 2193 ) Why Do I Have to Pay Taxes? - Publication 2105   (html version of Pub 2105) Criminal Investigation (CI) Overview - Publication 3859 Criminal Investigation (CI) Legal Source Tax Crimes - Publication 3861 Criminal Investigation (CI) Illegal Sources Financial Crimes - Publication 3860 Criminal Investigation (CI) Narcotics Related Financial Crimes    - Publication 3862 Where Do You Report Suspected Tax Fraud Activity? Criminal Tax Fraud Publications, Fact Sheets, News Releases and Media Contact Information Criminal Investigation (CI) Tax Fraud Alerts