(The Center Square) – Secret ballot elections at companies that receive taxpayer incentives is required in a new Alabama law. Gov. Kay Ivey signed Senate Bill 231 into law on Monday as Mercedes-Benz workers at the Vance plant near Tuscaloosa starting voting for possibly joining the United Auto Workers. The election ends on Friday. The new law, which was sponsored by Sen. Arthur Orr, R-Decatur, became effective after Ivey signed it. “This week in Tuscaloosa, we have a secret ballot taking place at the Mercedes plant,” Ivey said in a speech at the Huntsville/Madison County Chamber’s Alabama Upda…