Donald Trump’s new stock-buying strategy isn’t socialism, but it is a step toward a government-controlled economy. Recently, a handful of people—none of whom have ever invited me to their birthday party—accused President Donald Trump of being a socialist. Gavin Newsom, who many pundits credibly believe is the governor of California, said Trump is committing socialism by having the federal government buy stock in private companies. At the time of writing, the government has taken shares in Intel, MP Materials, Lithium Americas, U.S. Steel, and even a Canadian mining company that mines cobalt or some other stupid mineral I hate. This...