Reason stands aghast at the sight of an unprincipled, immoral, incorrigible public; And the word of God abounds in such threats and denunciations, as must strike terror into the heart of every believer.

On the surface it's curious, but I think there are good reasons for it.

This is a more militant union that most public sector unions. These workers face on a daily basis far more difficult working conditions than the standard government employee. The workers as a group feel management is too heavy-handed. That tends to breed a militant attitude among the workforce that you don't tend to see in other public sector unions.