House Democrats are setting records with their abuses of power, which means they aren’t stopping at just the Trump administration. Witness their new targeting of free-market nonprofits and businesses, straight out of the intimidation playbook.

Energy and Commerce Committee Chairman Frank Pallone Jr. a month ago sent a letter to five separate entities. The recipients included two nonprofits, Americans for Prosperity and the American Legislative Exchange Council; a trade association, American Fuel and Petrochemical Manufacturers;...