Old unions like this one that were originally more specific to a trade can and do attempt to expand and cover any type of trade if they want to. They also absor

Old unions like this one that were originally more specific to a trade can and do attempt to expand and cover any type of trade if they want to. They also absorb (merge with) smaller unions all the time, even if the original name has nothing to do with the trade union they merged with. The end goal of international unions is to unionize most major trades, hence the concept of a general strike, to increase the bargaining power of the entire working class collectively across trades.