Final answer:
The FBI's actions against Japanese Americans during World War II involved detention and relocation to internment camps rather than specific actions at a club. This was carried out under Executive Order 9066, resulting in over 110,000 Japanese Americans being interned on the basis of their ethnicity.
Step-by-step explanation:
The question relates to what the FBI did to some of the Japanese people at the jazz club during World War II. There isn't specific historical evidence that points to actions taken specifically at a jazz club. However, it is known that, following the signing of Executive Order 9066, the FBI and other government agencies took actions against Japanese Americans, which involved forcibly removing them from their homes and communities, arresting individuals suspected of disloyalty, and eventually internment. The Japanese, unlike German or Italian nationals, were targeted largely based on ethnicity and association within Japanese community organizations or Buddhist churches, often regardless of their individual histories or loyalties. Ultimately, over 110,000 Japanese Americans, many of whom were U.S. citizens, were placed in internment camps where they suffered various personal and financial losses.