This law equalized expatriation, immigration, naturalization, and repatriation between women and men. An expatriation tax is a tax on individuals who renounce their citizenship or residence. The Internal Revenue Code imposes an expatriation tax on people giving up U.S. citizenship. People giving up U.S. citizenship may be subject to an expatriation tax. People giving up US citizenship may be subject to an expatriation tax. When Saverin renounced, he had to pay that expatriation tax. The treaties were the first international recognition of the right of expatriation. Exiting high net worth and high income individuals may owe an expatriation tax. During this period of expatriation a total of 184 free persons were transported to Liberia. The law also extended the expatriation tax to cover ex-permanent residents as well. The law repealed sections 3 and 4 of the Expatriation Act of 1907. In January 2012, Dent co-sponsored the Enemy Expatriation Act with Senator Joe Lieberman. There were at least two large waves of expatriation. There were at least two large waves of expatriation of both Christians and Muslims alike. Terri-Ann White, Wark co-wrote "Speed Factory", an experimental work about distance and expatriation.