There were three types of organisations that engage in propaganda and fund raising—Front, Cover, and Sympathetic. Prior to the ethnic riots of 1983, attempts to raise funds for a sustaining military campaign were not realised. It was the mass exodus of Tamil civilians to India and western countries following the Black July ethnic riots, which made this possible. As the armed conflict evolved and voluntary donations lessened, LTTE used force and threats to collect money. LTTE was worth US$200–300 million at its peak. The group's global network owned numerous business ventures in various countries. These include investment in real estate, shipping, grocery stores, gold and jewellery stores, gas stations, restaurants, production of films, mass media organisations (TV, radio, print), and industries. It was also in control of numerous charitable organisations including Tamils Rehabilitation Organisation, which was banned and had its funds frozen by the United States Treasury in 2007 for covertly financing terrorism.