See U.S. Blows Up Tesla Radio Tower (page 293 of the September 1917 issue of The Electrical Experimenter): "Suspecting that German spies were using the big wireless tower erected at Shoreham, L. I., about twenty years ago by Nikola Tesla, the Federal Government ordered the tower destroyed and it was recently demolished with dynamite."
Leland I. Anderson, Nikola Tesla, Nikola Tesla on His Work with Alternating Currents and Their Application to Wireless Telegraphy, Telephony, and Transmission of Power, An Extended Interview, Twenty-First Century Books - 2002. page 159[1]
Leland I. Anderson, Nikola Tesla, Nikola Tesla on His Work with Alternating Currents and Their Application to Wireless Telegraphy, Telephony, and Transmission of Power, An Extended Interview, Twenty-First Century Books - 2002. page 159[2]