first bleg: employment law and h.r. metrics

Perhaps, a question for a labor lawyer: if a company claims its human resources department is so good that employees don’t need a union, can that claim be tested? Are there standardized polls? Surveys?

And if such surveys are required of employers with more than, say, 150 employees, are those results a matter of public record if the company receives or has received government subsidies or is a government contractor?