Federal politicians routinely lambast the tax code as full of loopholes favoring special interests and generating lobbying-then they add more loopholes generating even more lobbying and corruption. The Tax Cuts and Jobs Act of 2017 created special-interest tax breaks called “Opportunity Zones.” The law empowered governors and U.S. Treasury officials to carve up every state in the nation into winner and loser areas. Investment projects in the winner areas receive capital gains tax breaks, while projects in the loser areas get the short end of the stick. Apparently, the Treasury did not go along, but the episode shows how narrow tax breaks fuel the lobbying industry in Washington. Former casino executive Steve Wynn generated $2.1 billion and a big potential tax bill last March when he was forced to sell his stake in Wynn Resorts Ltd. after sexual-misconduct allegations. Less than three months later, he held a meeting with Treasury Department officials as they were writing regulations for a new tax incentive that had the potential to help him defer and reduce those taxes. Mr. Wynn met with senior Treasury officials on June 4 to discuss “Opportunity zones,” a break that was part of the 2017 Republican tax overhaul.