Ooh, tough one. Hmm, let me think...
If the word of those at the top says "Agree that you'll never quit and take a job with our competitor or we won't hire you.", that won't stick. That will get their contract tossed aside as contrary to public policy and unenforceable.
You don't seem to comprehend the idea of power WITHIN the organization.
Dictatorial power is not absolute power over everything. It never was. That is a child's understanding of dictatorship.
The King of England didn't tell the peasants of France what to do. He didn't tell people how to plow their fields.
If the word of those at the top says "Don't talk union to the other workers or you're fired.", that won't stick. That will get their asses stomped on for unfair labor practices.
The asshole at the top giving orders is not the dictator of society. They are just the dictator of their little scummy dictatorship. They have to follow the laws of society.
That does not mean they are not the dictator within their scummy little dictatorial scheme. They have the power to make any rules within the organization within the laws of society.
These scumbag dictators can decide to move all the jobs, except theirs, somewhere else. Union or no union.
How is that not absolute power within the organization?
If you can just wipe away the entire work force and move and then trap others within your scummy scheme how is that not absolute power?
If the word of those at the top says "Have sex with us or you're fired.", that won't stick. That will get their asses sued off for sexual harassment.
More of the 3 year old understanding of dictatorship.
If the word of those at the top says "Work for $2.00/hour or you're fired.", that won't stick. That will get their asses prosecuted for minimum wage law violation.
You can probably be told they are not absolute dictators a hundred times and that no dictator ever was an absolute dictator but it won't matter.
You love the very idea of a dictatorial power structure and will defend your love any way you can. As humans have always defended that which they love.
If the word of those at the top of the corporation were the law of the corporation, all those words would stick. So no, the word of those at the top of the corporation not the law of the corporation.
The dictator(s) decide the direction of the organization. They decide what the organization will do. They take the lions share for themselves and give others as little as possible.
And if they want to they will fire all the workers that created the capital they use to move to China.
You are waving your arms and shouting a dictatorial power system is not a dictatorial power system.
So being uppity enough to contradict you and post a counterargument qualifies as "shouting" now, does it?
Childish misunderstandings and a love of dictatorial power structures are not arguments.