It’s very hard here, especially depending on your circumstances - and even when a union is formed they’re often unable to really… get any meaningful progress. Depending on your particular employment, it’s effectively impossible - and it gets harder the poorer you are.
It’s why it’s sometimes frustrating to hear Americans tell other Americans (often less well off than they are) to “just form a Union!”. The leftist version of “pull yourself up by the bootstraps”