It seems like there was a largely unspoken agreement among the wealthiest in the West throughout the middle of the 20th century, particularly in the aftermath of the Depression, World War II, and the rise of communism, that they wouldn’t try to extract the absolute maximum of wealth from the workers and try to keep a stable, happy middle class and even lower class that had a relatively comfortable existence without feeling too at risk of losing everything.

Actually, the richest people in America were terrified of FDR and the New Deal, and even attempted a fascist coup in order to overthrow him. Fun fact, George W. Bush's grandfather, Prescott Bush, was implicated in it!

Buddy look at the tax code post great depression. There was no agreement the government said fuck you pay them.

As you get to the end of that century and into this century, the wealthiest forgot why that policy existed

The collapse of the Soviet Union removed the threat of an alternative and "proved" that capitalism was the superior ideology, pushing their confidence that they could do no wrong through the roof.

Not much formal organizing needs to happen, based on the way this particular CEO found out.

It seems like there was a largely unspoken agreement among the wealthiest in the West throughout the middle of the 20th century, particularly in the aftermath of the Depression, World War II, and the rise of communism, that they wouldn’t try to extract the absolute maximum of wealth from the workers and try to keep a stable

Thats because we stopped them, they always try as much as they are allowed to.

It's "rein in any unrest". I'm not pointing this out to be a grammar nazi, but because "reign in" is an interesting slip in the context of your post.