​In a pair of landmark rulings issued Dec. 17, the National Labor Relations Board (NLRB) decided that companies—unionized and nonunionized alike—can ban employees from using work e-mail for nonbusiness purposes, including union organizing, and may

prohibit them from discussing confidential interviews during the investigations. The two decisions—Caesars Entertainment Corp. and Apogee Retail respectively—overturn two controversial Obama board decisions, Purple Communications and Banner Health System.