The recent incident featuring Twitter owner Elon Musk comparing nonagenarian financier and philanthropist George Soros to the supervillain Magneto again opened debate about where legitimate ideological criticism of the prolific political funder ends and antisemitic hate begins. Now, two Jewish conservatives have launched a grassroots initiative to clarify. Newsweek senior editor-at-large Josh Hammer and Missouri Attorney General candidate Will Scharf have launched “Jews Against Soros.” Their new website says: “There is nothing antisemitic about identifying the many ways that George Soros and his network of organizations fund the radical left. Leftism isn’t Judaism, and being anti-leftist is not the same...