"This culture of silence is a health and safety issue for our members, and it also stops the organisation from developing in the best possible way", union head Lena Nitz told Swedish Radio News.
She adds that the fear of speaking out among many officers may have had a negative impact on the recent re-organisation of the force.
"Certain issues are not brought up then, and you can't put forward opinions that would have improved the employers' proposals. And we have noticed that in the re-organisation", she adds.
A similar survey among the general public shows that only one-in-ten Swedes in general is scared of speaking out at work.