The Mann Act is a federal criminal law, originally passed in 1910 as the White-Slave Traffic Act, that makes it a crime to transport another person across state lines or international borders, or to persuade or coerce them to travel, for prostitution or any sexual activity that violates criminal law. It is codified in Chapter 117 of Title 18 of the U.S. Code. Penalties start at up to 10 years in federal prison for a basic transportation offense and reach life imprisonment when the victim is a child.
What the Law Criminalizes Today
The Mann Act is not a single offense. It is a small cluster of related federal crimes, each aimed at a different link in the chain between transportation and illegal sex.
Transporting a Person Across State Lines
Section 2421 is the core provision. It applies to anyone who knowingly moves another person across state lines, national borders, or through U.S. territories with the intent that the person engage in prostitution or any sexual activity that violates criminal law. Attempts count, so a trip stopped before it crosses a state line can still support charges. The mode of travel is irrelevant: a personal car, a plane ticket, or a bus ride all satisfy the interstate element. A conviction carries up to 10 years in federal prison.1Office of the Law Revision Counsel. 18 USC 2421 – Transportation Generally
Enticement, Coercion, and Online Solicitation
Section 2422 reaches the people who talk someone into traveling, even if they never personally drive a car or buy a plane ticket. It criminalizes persuading, inducing, enticing, or coercing any person to travel in interstate or foreign commerce for prostitution or illegal sexual activity. Enticement often takes the form of false promises about jobs, housing, or financial stability; coercion involves threats or exploitation of someone in a desperate situation. A conviction involving an adult carries up to 20 years in federal prison.2Office of the Law Revision Counsel. 18 USC 2422 – Coercion and Enticement
Subsection (b) targets online predators. It covers anyone who uses the mail, the internet, or any other facility of interstate commerce to persuade, entice, or coerce a person under 18 into prostitution or criminal sexual activity. Federal courts have treated the internet itself as a facility of interstate commerce, so chat messages, social media conversations, and dating app exchanges fall within the statute’s reach. This subsection carries a mandatory minimum of 10 years and a maximum of life in prison.2Office of the Law Revision Counsel. 18 USC 2422 – Coercion and Enticement
Transportation of Minors and Sex Tourism
Section 2423 addresses the most severely punished conduct under the Mann Act. Knowingly transporting anyone under 18 across state lines or international borders with intent that the minor engage in prostitution or illegal sexual activity carries a mandatory minimum of 10 years and a maximum of life in prison.3Office of the Law Revision Counsel. 18 USC 2423 – Transportation of Minors
The same section reaches sex tourism. A U.S. citizen or permanent resident who travels abroad with the intent to engage in illicit sexual conduct with a minor, or who does so while overseas, faces up to 30 years in prison. The same maximum applies to anyone who arranges or facilitates such travel for commercial gain, and to a citizen or permanent resident who uses a position at an organization affecting interstate commerce to further illicit sexual conduct with a minor. Conspiracy and attempt carry the same penalties as completed offenses.3Office of the Law Revision Counsel. 18 USC 2423 – Transportation of Minors
Promoting Prostitution Through Online Platforms
Section 2421A, a more recent addition, targets the digital infrastructure of prostitution. Anyone who owns, manages, or operates a website or online service with the intent to promote or facilitate prostitution faces up to 10 years in prison. The maximum climbs to 25 years if the platform promotes prostitution involving five or more people, or if the operator acts with reckless disregard for the fact that the platform is being used for sex trafficking. The aggravated version also carries mandatory restitution. An affirmative defense exists where prostitution is legal in the jurisdiction being targeted, but the defendant must prove that by a preponderance of the evidence.4Office of the Law Revision Counsel. 18 USC 2421A – Promotion or Facilitation of Prostitution and Reckless Disregard of Sex Trafficking
What Prosecutors Must Prove About Intent
Every Mann Act offense requires a specific mental state. Under Section 2421, the defendant must have knowingly transported the person with the intent that they engage in prostitution or criminal sexual activity. Under Section 2422, the defendant must have knowingly persuaded or coerced the person to travel for those same purposes.1Office of the Law Revision Counsel. 18 USC 2421 – Transportation Generally This is not a strict liability crime. Simply driving someone across a state line is not enough; the illegal sexual purpose has to be a motivating reason for the trip.
Timing matters. The intent must exist at the time the interstate travel begins or is arranged. If two people travel across state lines for a legitimate reason and only later decide to engage in illegal activity, the interstate transportation element is not satisfied. Prosecutors typically establish intent through the defendant’s own statements, communications, prior behavior, and the circumstances waiting at the destination.
Prison Terms, Fines, Supervised Release, and Registration
The prison exposure varies sharply by section. A quick reference:
- Section 2421 (transportation of an adult): up to 10 years.
- Section 2422(a) (enticement of an adult): up to 20 years.
- Section 2422(b) (online enticement of a minor): 10-year mandatory minimum, up to life.
- Section 2423(a) (transportation of a minor): 10-year mandatory minimum, up to life.
- Section 2423 (foreign travel or facilitation involving a minor): up to 30 years.
- Section 2421A (operating a prostitution-facilitating platform): up to 10 years, or up to 25 years in aggravated cases.
Federal law sets a baseline maximum fine of $250,000 per felony count for individuals.5Office of the Law Revision Counsel. 18 USC 3571 – Sentence of Fine Offenses involving minors often result in both a fine and imprisonment.
Supervised release is mandatory. Under 18 U.S.C. ยง 3583(k), anyone convicted under Sections 2421, 2422, or 2423 faces a minimum of five years of supervised release after prison, with the possibility of lifetime supervision. Conditions frequently restrict internet use, contact with minors, and travel. If a registered offender commits another qualifying sex crime during supervised release, the court must revoke supervision and impose at least five additional years of imprisonment.6Office of the Law Revision Counsel. 18 USC 3583 – Inclusion of a Term of Supervised Release After Imprisonment Mann Act offenses also trigger sex offender registration under the Sex Offender Registration and Notification Act (SORNA).
Restitution to Victims
Courts must order restitution in Mann Act cases. Section 2429 requires the defendant to pay the victim the full amount of their losses, and if the offense involved commercial sex acts, the defendant must also pay the greater of their gross income from the victim’s services or the value of those services.7Office of the Law Revision Counsel. 18 USC 2429 – Mandatory Restitution
“Full losses” is defined broadly and covers medical, psychiatric, and psychological care; physical and occupational therapy; temporary housing, transportation, and child care; lost wages; reasonable attorney fees; and other harm resulting from the offense. Both incurred and reasonably projected future costs are included.8Office of the Law Revision Counsel. 18 USC 2259 – Mandatory Restitution Restitution is mandatory regardless of the defendant’s ability to pay at sentencing.
How the Modern Statute Differs from the Original
The Mann Act took its current shape in 1986. The original 1910 statute applied only to “any woman or girl” transported for “prostitution or debauchery, or for any other immoral purpose.” That last phrase was the trouble. In Caminetti v. United States (1917), the Supreme Court held that the law reached non-commercial consensual relationships, reasoning that the plain text drew no line between paid and private sexual conduct.9Justia. Caminetti v. United States
That reading opened the door to decades of selective and politically motivated prosecutions. Jack Johnson, the first Black heavyweight boxing champion, was convicted in 1913 by an all-white jury of transporting a white woman from Pittsburgh to Chicago; President Trump issued a full posthumous pardon in 2018, acknowledging that the conviction came “during a period of tremendous racial tension.”10Trump White House Archives. Remarks by President Trump at Pardoning of John Arthur Jack Johnson Charlie Chaplin was prosecuted in 1944 and acquitted; Chuck Berry was convicted in 1959 and served 20 months.
Public Law 99-628, enacted in 1986, rewrote the law. It replaced “any woman or girl” with “any individual,” making the statute gender-neutral, and it scrapped the “immoral purpose” standard in favor of a concrete one: the transportation must be intended to lead to “prostitution, or any sexual activity for which any person can be charged with a criminal offense.” Outdated references to common carriers such as trains and buses were also removed.11Congress.gov. Public Law 99-628 The intended activity today must violate an actual criminal statute; subjective morality no longer supplies the trigger.
The Mann Act and Modern Trafficking Law
The Mann Act remains a standalone federal crime, but it now operates alongside the Trafficking Victims Protection Act (TVPA) and related statutes that Congress has enacted since 2000. The two frameworks cover overlapping but distinct conduct. The Mann Act focuses on interstate transportation for illegal sexual activity. The TVPA targets the broader exploitation of individuals through force, fraud, or coercion for labor or commercial sex acts.
Federal prosecutors often charge Mann Act violations alongside TVPA counts in the same case, using whichever statute best fits the evidence. The Mann Act’s transportation element is especially useful when the evidence clearly shows interstate movement but the force-or-coercion elements of trafficking are harder to prove. The TVPA, in turn, reaches situations where exploitation occurs entirely within a single state, which the Mann Act cannot.