It's not very difficult to confuse the public by distributing false and misleading literature. Until the 1950's, the Jehovah's Witnesses were very open about their opposition to vaccinations.

In January 1929 the Jehovah's Witnesses Golden Age literature said, "Thinking people would rather have smallpox than vaccination, because the latter sows seeds of syphilis, cancers, eczema, erysipelas, scrofula, consumption, even leprosy and many other loathsome affections. Hence the practice of vaccinations is a crime, an outrage, and a delusion." (Golden Age is a predecessor to "Awake", a Jehovah's Witnesses publication)

In February 1931 the Jehovah's Witnesses Golden Age literature said, "Vaccination is a direct violation of the everlasting covenant that God made with Noah after the flood. Vaccination never saved human life. It does not prevent smallpox."