Illegal entry is the act of foreign nationals arriving in or crossing the borders into a country in violation of its immigration law. Human smuggling is the practice of aiding people in crossing international borders for financial gain, often in large groups. Human smuggling is associated with human trafficking. A human smuggler will facilitate illegal entry into a country for a fee, but on arrival at their destination, the smuggled person is usually free. Trafficking involves physical force, fraud, or deception to obtain and transport people, usually for enslavement or forced prostitution. Presently, India is constructing a fence along the border to restrict illegal traffic from Bangladesh. The Indo-Bangladeshi barrier is long. The stated aim of the fence is to stop infiltration of terrorists, prevent smuggling, and to bring a close to illegal immigration from Bangladesh. Tampa affair In Australia, mandatory immigration detention was revived in 1992 for all foreigners who arrive in Australia without a visa. That only "border applicants" are subject to detention has sparked criticism, as it is claimed to unfairly discriminate against certain migrants. Suspected Irregular Entry Vessel was the name used by the Australian Defence Force or Australian Coastwatch for maritime vessels which were suspected to be attempting to reach Australia without authorisation. In practice, these boats were often carrying asylum seekers who had departed from Indonesia on the final leg of a journey which started in countries such as Iraq and Afghanistan after paying people smugglers. During 1933–1948, the British government limited Jewish immigration to Palestine with quotas, and following the rise of Nazism to power in Germany, illegal immigration to Palestine commenced. The illegal immigration was known as Aliyah Bet ("secondary immigration"), or Ha'apalah, and was organized by the Mossad Le'aliyah Bet, as well as by the Irgun. Immigration was done mainly by sea, and to a lesser extent overland through Iraq and Syria.