Can An Employer Bar Employees From Comparing or Discussing Their Pay or Wage Rates?

The answer is probably no. Recently, the United States Court of Appeals ruled in Flex Frac Logistics v. National Labor Relations Board that an employer policy that could be reasonably interpreted as forbidding employees from discussing and comparing their pay rates violated the National Labor Relations Act. 

But this court decision is not necessarily the last word and other employers may have differences in the language of their policies that make a difference.