He was a Tsarist general and white Russian loyalist. He was involved in Pan-Slavism, White Russian and anti-semitic activism, including various chivalric orders and cultural organisations, amongst the diaspora community in America. Spiridovich is perhaps best known for authoring a book positing a concise conspiracy consisting of 300 Jewish families entitled "Secret World Government or The Hidden Hand".
Spiridovitch was President of the Slavonic Society of Russia and of the Latino-Slavic League of Paris and Rome.
According to Lord Alfred Douglas, well-known men like Henry Ford and newspapers like the Financial Times in London took him seriously and helped him to reach a fairly wide public. Arthur Cherep-Spiridovich died in a Staten Island hotel, with a gas line pipe stuck in his throat.
The police reported that he had committed suicide. However, when the body was discovered at the hotel by the staff, the gas line was shut official
Number autopsy was performed and no further investigation put into the case.