If employees don’t own a meaningful part of the company today and pay 1-1.5% of their wages to a union, how will that give the union enough money to buy a controlling stake in the company?

Amazon’s market cap is ~$1.25T. Under the conservative (false) assumption that a union bidding for half the shares would not move the price at all, that union would have to spend ~$625B on those purchases, meaning total employee dues would be that much, implying a wage base (at 1% dues) of $62.5T, or more than 3 years of the entire US GDP.

Said differently: if employees could buy half their company for 1% (or even 10%) of their wages, there’d be no need for them to have a union negotiate their wages.