Strikes are one of the basic rights that have been won over many centuries with blood and tears. So if you are already working, it makes sense for you to be in a trade union or to actively support a union. They organise strikes in order to negotiate better conditions for employees than employers. And as always, the more people are involved, the more you can achieve together.
A list of unions can be found on Wikipedia. Not all unions show the necessary bite to employers and some union representatives have already become very tame in their well-paid positions. It is up to us to give strike action a more important place in society. So join in and get involved.