It takes constant vigilance to prevent that union from being captured by management.
Being captured by the management is its normal state, that's how it evolved in the first place.
That's a great analogy. Government = worker's/consumer's/people's union. Management = capitalism/corporations.
What is capitalism?
That's because another group of people made a pact with the devil, and a third group just shrugged their shoulders when everyone had a chance to nullify that pact....
Assuming you live in a democracy (we'll see if America still counts in 3 years), elect a better one.