Leo Kuvayev
Leonid Aleksandrovitch Kuvayev (born 13 May 1972), who usually goes by the name of Leo, is a Russian/American spammer and convicted child molester believed to have been the ringleader of one of the world's biggest spam gangs. In 2005, he and six business partners were fined $37 million as a result of a lawsuit brought by the Massachusetts attorney general.