No this is not a good thing.
Binding workers right to political views is dangerous and other countries show that unions can work without any party propaganda.
Fighting for "workers rights" is a political position.
Maybe you're making a distinction between party politics (e.g. endorsing specific candidates) and pushing for general policies, but I think it's incoherent to claim that labor unions are apolitical.
Aligning to a party can be argued, I'd say it's best to break things up into policies more than "teams" but still.