hospital since the cost of medication was too high. Another problem caused by this treaty was that the Japanese government created a law which stated that Korean residents in Japan had to be fingerprinted since Zainichi Koreans had two names (their original name and a name given by the Japanese government). Under this law, Zainichi Koreans had to reveal their identity to the public because when they visited the city hall to provide their fingerprints, their neighbors found out that they were Zainichi Koreans. Therefore, Zainichi Koreans were forced to reveal their identity to Japanese and faced discrimination from them. This made their lives even more difficult. In order to protect themselves, many Zainichi Koreans protested against this law. Mindan and many Zainichi Koreans opposed this law, but the law wasn't repealed until 1993. Until then, Zainichi Koreans could not escape from the social discrimination which they had faced in Japanese society. Furthermore, it was hard for the Zainichi Koreans to get a job due to discrimination. Especially, it was very hard for Zainichi Koreans to become public employees since Japan only let Japanese nationals become public employees at that time. Since many Zainichi Koreans couldn't get a proper job, they began to get involved in illegal jobs such as "illegal alcohol production, scrap recycling, and racketeering" (Min). As a result, many Zainichi Koreans ended up living in slums or hamlets since Japanese real estate agents refused to let Zainichi Koreans rent houses. Zainichi today have established a stable presence in Japan after years of activism. Through Mintohren, community support by Zainichi organizations (Mindan, Chongryon, among others), other minority groups (Ainu, Burakumin, Ryūkyūans, Nivkhs and others), and sympathetic Japanese, they have improved the social atmosphere for Zainichi in Japan. There are also Koreans living in Japan who try to present themselves as Japanese to avoid discrimination. Most younger Zainichi now speak only Japanese, go to Japanese schools, work for Japanese firms and increasingly now marry Japanese. Most naturalization occurs among the young during the period when they seek formal employment or marriage. Those who have already established their life often choose to retain their South Korean or Joseon nationality as part of their heritage. Assimilation One of the most pressing issues of the Zainichi community is the rate of assimilation of Zainichi into Japan. About 4,000 to 5,000 Koreans naturalize in Japan every year out of slightly less than 480,000.