In 1908 the Shinmin-Hoe established the Tae-Song (large achievement) School in Pyongyang to provide Korean youth with an education based on national spirit. He ran a ceramic kiln to raise funds for the publications of books for young people. However, the political environment of the time was not conducive to the founding of such a school; the Japanese were in the process of actively banning education for Koreans. By denying the Korean children proper schooling, the Japanese wanted to ensure their illiteracy, thus essentially creating a class of slave workers.
Together with Yi Kap, Yang Ki-tak, and Shin Chae-Ho, he embarked on a lecture tour throughout the nation, warning of a national crisis incurred by the Japanese and urged the public to unite to resist the Japanese. Ahn repeatedly told Japanese leaders that Japan would profit much by keeping Korea as a friend rather than annexing Koreans and inviting their resentment.
By 1910 the Shinmin-Hoe had around 300 members and represented a threat to the occupation. The Japanese were actively crushing these types of organizations, and the Shinmin-Hoe quickly became a target of their efforts. In December of 1910 the Japanese governor general, Terauchi, was scheduled to attend the dedicating ceremony for the new railway bridge over the Amnok River. The Japanese used this situation to pretend to uncover a plot to assassinate Terauchi on the way to this ceremony. All of the Shinmin-Hoe leaders and 600 innocent Christians were arrested. Under severe torture, which led to the deaths of many, 105 Koreans were indicted and brought to trial. During the trial, the defendants were adamant about their innocence. The world community felt that the alleged plot was such an obvious fabrication that political pressure grew, and most of the defendants had to be set free. By 1913, only six of the original defendants had received prison sentences.