America’s institutions are using the invasion of the Capitol building by a relatively small number of extremists as a pretext for carrying out a purge of conservatives that they have long desired. The barons of the social media world are leading the charge, but others are following. The latest conservative victim of the purge is Rep. Elise Stefanik, a member of Congress. Harvard has removed her from the Kennedy School’s Senior Advisory Committee. The Kennedy School is Harvard’s public policy institute. The decision to sack Stefanik was made by Doug Elmendorf, dean of the Kennedy School, along with Mark Gearan,...