I hope people won't downvote this due to their political views. At the very least this subject warrants significant attention for MRA's, as about 95 percent of workplace deaths are male.

source

Results

The Local Average Treatment Effect of a 1% decline in unionisation attributable to RTW is about a 5% increase in the rate of occupational fatalities. In total, RTW laws have led to a 14.2% increase in occupational mortality through decreased unionisation.

Conclusion

These findings illustrate and quantify the protective effect of unions on workers’ safety. Policymakers should consider the potentially deleterious effects of anti-union legislation on occupational health.

Edit: and now this post is being downvoted. I think this will be an interesting case study to see if the MRM has become so far right as to qualify as literally fascist. Even Ronald Reagan supported labor unions.