Transnational crimes are violations of law that involve more than one country in their planning, execution, or impact. These offenses are distinguished from other crimes in their multinational nature, which poses unique problems in understanding their causes, developing prevention strategies, and in mounting effective adjudication procedures. Transnational crimes can be grouped into three broad categories involving provision of illicit goods (drug trafficking, trafficking in stolen property, weapons trafficking, and counterfeiting), illicit services (commercial sex and human trafficking), and infiltration of business and government (fraud, racketeering, money laundering, and corruption) affecting multiple countries.