Transnational crimes are crimes that have actual or potential effect across national borders and crimes that are intrastate but offend fundamental values of the international community. The term is commonly used in the law enforcement and academic communities. Transnational organized crime (TOC) refers specifically to transnational crime carried out by crime organizations.
The word transnational describes crimes that are not only international (that is, crimes that cross borders between countries), but crimes that by their nature involve cross-border transference as an essential part of the criminal activity. Transnational crimes also include crimes that take place in one country, but their consequences significantly affect another country and transit countries may also be involved. Examples of transnational crimes include: human trafficking, people smuggling, smuggling/trafficking of goods (such as arms trafficking and drug trafficking and illegal animal and plant products and other goods prohibited on environmental grounds (e.g. banned ozone depleting substances), sex slavery, terrorism offences, torture and apartheid.
Transnational crimes may also be crimes of customary international law or international crimes when committed in certain circumstances. For example, they may in certain situations constitute crimes against humanity.
The international community is confronted with an increasing level of transnational crime in which criminal conduct in one country has an impact in another or even several others. Drug trafficking, human trafficking, computer crimes, terrorism, and a host of other crimes can involve actors operating outside the borders of a country which might have a significant interest in stemming the activity in question and prosecuting the perpetrator. Contemporary transnational crimes take advantage of globalization, trade liberalization and exploding new technologies to perpetrate diverse crimes and to move money, goods, services and people instantaneously for purposes of perpetrating violence for political ends.