There are different unions for different trades. Stop trying to sound so smart, you keep failing.
Oh, great, trade unions. That never caused any issues for worker’s unity. If you can’t organise everyone, from tech lead to cleaning staff, in the same industrial union you’re playing right into the capitalists’ divide and conquer game.
Not so. It makes sense to organise in trade unions. The heads of those unions are on the same side most of the time, as it would be in this case, and they can easily coordinate their actions. But in some cases the interests of one trade have no bearing on another, or are even in opposition, in which case it would be somewhere between difficult and impossible to organise a balloted action across the entire union. Thus nullifying the strength of the union and playing right into the capitalist’s hands.