Serrano also developed an interest in forms of religious or spiritual practice, including both Western esotericism and Hinduism. In late 1941, Gallo suggested that Serrano could support the German and Italian war effort not just through his publications, but also on the etheric Inner Planes, introducing him to an esoteric order sympathetic to Nazism. Serrano later claimed that this order had been founded near the start of the 20th century by a German migrant known as "F. K." Serrano was initiated into the group in February 1942.