In January through March of 1918 Crowley began a series of magickal workings called the Amalantrah Workings in furnished rooms in Central Park West, New York City. These were a performed via Sexual & Ceremonial Magick (his spelling) with the intent to invoke certain “intelligences” to physical manifestation. In actuality, the workings typically manifested as a series of visions and communications received through the medium-ship of his partner, Roddie Minor.
Phenomena Magazine: Alien Abductions and Aleister Crowley: Magick or UFOs?
(via New World Disorder).