NEW YORK—U.S. authorities on Tuesday filed criminal charges against a cryptocurrency executive and civil charges against him and his sister, accusing them of defrauding retail investors out of millions of dollars with a digital token known as Ormeus Coin. In papers filed in Manhattan federal court, the Justice Department said John Barksdale lied about the value and profitability of Ormeus Coin’s mining assets, including that the coin was backed by a $250 million mining operation generating more than $5 million of monthly revenue. Barksdale and his sister JonAtina Barksdale were separately charged by the Securities and Exchange Commission with conducting fraudulent unregistered offerings of Ormeus Coin. The SEC said the Barksdales since 2017 raised $124 million from more than 20,000 investors through their multi-level marketing company Ormeus Global SA, and spent millions of dollars on travel, real estate and other personal expenses. Authorities said the siblings promoted Ormeus Coin through …