بروتوكولات حكماء صهيون
In 1920, Webster became a contributor to "The Jewish Peril", a series of articles in the London "Morning Post" centred on the (forged) document "The Protocols of the Elders of Zion". These articles were compiled and published in the same year in book form under the title of "The Cause of World Unrest". Webster claimed that the authenticity of the "Protocols of the Elders of Zion" was an "open question".