Not necessarily. You could choose to pay taxes on that income to the IRS. The IRS provides a way to report illegal income and pay taxes on it.
https://www.irs.gov/publications/p17
> Illegal activities. Income from illegal activities, such as money from dealing illegal drugs, must be included in your income on Form 1040, line 21, or on Schedule C or Schedule C-EZ (Form 1040) if from your self-employment activity.
Does anyone pay taxes on income from illegal drugs? Probably not "street dealers", but I would suspect people who earn income from marijuana businesses that are legal in some states but illegal federally probably do pay tax on that income.
Furthermore, IRS tax returns are confidential. The IRS is generally prohibited from tipping off police about reported illegal income, though there are various loopholes: https://money.cnn.com/2013/02/28/news/economy/illegal-income...