At this time in the United States, McCarthyism was at its height, generating fear and suspicion of entertainment industry figures, academics, military figures, and government officials by accusing them of real or suggested links to communist activities. The TSO was required to submit to United States immigration authorities all the names of its musicians and other staff who would be accompanying the tour. The immigration department approved visas for all but seven musicians, suspecting them of communist activities. One of the musicians was later cleared, leaving six musicians who were denied entry.