I think it really depends on how it's manifested at a particular workplace. It's hard for me to comment. It's something that you need to ask the specific affiliates as they come forward, as your study continues.
In principle, when you first become a shop steward, you're encouraged to try to resolve problems informally without having to go as far as a grievance. But sometimes that's just not possible. If people aren't meaningfully going through an alternative dispute resolution, then sometimes you need to have formal processes. Sometimes the situation is so extreme that you can't; you just have to take formals steps.