Sean “Diddy” Combs is set to be sentenced Friday for violating the federal Mann Act, an anti-prostitution law with a century-old history.

Although he was acquitted of sex trafficking and racketeering charges, Combs was convicted in July of flying people around the country, including his girlfriends and male sex workers, to engage in paid sexual encounters.

The Mann Act makes it illegal to transport someone across state lines for the purpose of prostitution or other illegal sex acts.

Over the years, the law has been used to prosecute R&B superstar R. Kelly, Jeffrey Epstein companion Ghislaine Maxwell, musician Chuck Berry and, more than a century ago, boxer Jack Johnson.

Its broad wording and a subsequent Supreme Court interpretation once allowed prosecutors to bring cases against inter

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