 On April 12, 1961, del Valle invoked "The Protocols of the Elders of Zion" (an antisemitic hoax) during a speech before the United States Daughters of 1812, in an attempt to "prove" that Communism and Socialism were introduced to Russia by an "Invisible Government" whose intention was to destroy that country.Del Valle also belonged to a group known as the "Sons of Liberty", established in 1967 in Annapolis, Maryland and named after the secret patriotic society which directed the actions of the Boston Tea Party on December 13, 1773.Lieutenant General Pedro del Valle was married to Katharine Nelson (1890–1983).