Tan Chong Tee was a spy working for Force 136. Their objectives were to collect information about the Japanese army so as to find motives or methods to bring down the army. Of course the Japanese could not know that he was a spy if not he would be killed straight away. So each of these spies had a day job to hide their real identity from the Japanese. Like going "under cover". So Tan Chong Tee worked as a business man. He also participated in anti-Japanese activities. Such as boy-cotting Japanese goods and did fund-raising to support war efforts in China.