Individual employees do not matter. Get a group of employees together to act in concert and you have a negotiating bloc that a company cannot ignore.
Especially as the bloc grows. If the "someone abroad" is also part of the same bloc, management ends up running out of people to turn to. A rising tide floats all boats.
(It's even more extreme in some countries. I've heard tale of situations in Scandinavian nations where a restaurant owner who mistreats their serving staff will find, in addition to the staff leaving and nobody being willing to scab for them, that their deliveries are delayed because nobody will drive ingredients to them and if their sink breaks down no plumber will take the contract to fix it).
Especially as the bloc grows. If the "someone abroad" is also part of the same bloc, management ends up running out of people to turn to. A rising tide floats all boats.
(It's even more extreme in some countries. I've heard tale of situations in Scandinavian nations where a restaurant owner who mistreats their serving staff will find, in addition to the staff leaving and nobody being willing to scab for them, that their deliveries are delayed because nobody will drive ingredients to them and if their sink breaks down no plumber will take the contract to fix it).