Many people assume Toys R Us went bust because they were unprofitable. But that's not true — they were actually turning a profit. They went bust because a PE firm bought them, then forced Toys R Us itself to pay the debt the PE firm ran up buying them.
But nowadays in practice, it's usually a hostile takeover that strips companies and kills jobs to enrich the PE execs.
-Hold PE firms responsible for a portion of debt from a leveraged buyout.
-Require worker salaries and pensions be settled first in the event of a PE-held company's bankruptcy.
-Require workers get a vote on public boards of directors.
PE firms could still exist, but they'd have to act in the interest of the companies they buy.
Some European countries already restrict PE firms this way and it hasn't killed capitalism. It's actually made capitalism work better, because profitable companies don't get randomly chewed up and shit out by a small group of rich people.