If government student loans begin repayment in the U.S, what would happen if nobody paid?

Inspired by another post in this sub. I commented that the government can pry my money from my dead body, but I'm wondering what consequences to mass non repayment might be? I know one big road block to mass striking is that we are all living paycheck to paycheck, but what if we just refuse to give them that money? Genuine question, I have no clue what the fuck I'm talking about. TIA Edit: alright folks thanks for the answers! i've gotta go back to my shitty job, thanks for indulging me & giving really helpful responses. ill probably respond more at some point.