The conviction in the Federal Court at Salt Lake City, Utah, on May 15, 1922, of Matthew McBlain Thomson, Thomas Perrot and Dominic Bergera, of using the mails to defraud, was the culmination of efforts of the United States Government, begun in 1915, to have a reckoning with the perpetrators of one of the most ingenious mail frauds, and the most daring and spectacular Masonic imposture in American history. No one can study the facts in the case without sensing keenly the great importance of this trial, both in the history of crimes and the history of Masonry. Future accounts of celebrated American mail frauds will surely be incomplete without some mention of this bold swindle which has gone its way without molestation for more than a decade.