There are certain acts that have been passed to regularize the process of availing citizenship by foreigners, such as:
The Passport (Entry in India) Act, 1920 – Under this act, the foreigners entering India are required to get visa from India Missions. The act also prescribes specific documents for submission during their valid travel for allowing into the country.
The Foreigners Act, 1946 – This act regulates the entry and the residence of the foreigners within the Indian borders until their departure from the country.
The Registration of Foreigners Act, 1939 and The Registration of Foreigners Rules, 1992 – It mandates that certain foreigners who stay past their specified visa period must register with the Registration Officer.