In criminal law, kidnapping is the unlawful abduction, asportation and confinement of a person against their will. Kidnapping is typically but not necessarily accomplished by use of force or fear; i.e., it also usually involves menace/assault or/and battery; but it is still kidnapping without those additional elements, or if a person is enticed to enter the vehicle willingly. Kidnapping may be done to demand for ransom in exchange for releasing the victim, or for other illegal purposes. Kidnapping can be accompanied by bodily injury which elevates the crime to aggravated kidnapping. Kidnapping of a child is known as child abduction, which is a separate legal category. Kidnapping of children is usually done by one parent or others. The kidnapping of adults is often for ransom or to force someone to withdraw money from an ATM, but may also be for sexual assault. Children have also been kidnapped for the commission of sexual assault. In the past, and presently in some parts of the world (such as southern Sudan), kidnapping is a common means used to obtain slaves and money through ransom. In less recent times, kidnapping in the form of shanghaiing (or "pressganging") men were used to supply merchant ships in the 19th century with sailors, whom the law considered unfree labour. Criminal gangs are estimated to make up to $500 million a year in ransom payments from kidnapping. Kidnapping has been identified as one source by which terrorist organizations have been known to obtain funding. Bride kidnapping is a term often applied loosely, to include any bride "abducted" against the will of her parents, even if she is willing to marry the "abductor". It still is traditional amongst certain nomadic peoples of Central Asia. It has seen a resurgence in Kyrgyzstan since the fall of the Soviet Union and the subsequent erosion of women's rights. Express kidnapping is a method of abduction used in some countries, mainly from Latin America, where a small ransom, that a company or family can easily pay, is demanded.