Joe Biden has begun staffing the upper ranks of the U.S. Treasury and Council of Economic Advisers with union-doting, tax-loving, spending-happy economists sure to raise the blood pressure of anyone wistful about the American free market. Some reckon Biden might even nominate his abortive socialist ex-rival, Bernie Sanders, as labor secretary. (Cringe.) Compared with all the ado over Biden’s domestic-policy chiefs, his top foreign-policy appointees have been met with a collective “whatever.” Graeme Wood of The Atlantic called the first three nominees Biden announced “the equivalent of a warm cup of Ovaltine with a melatonin chaser.” Yet secretary of state...