IIRC, Most of the Enron employees didn't have any say in where their money was invested, and when the company was collapsing they were prohibited from pulling their money out.
They absolutely had a say in where their money was invested. They voluntarily chose Enron stock, because it was available to them at a discount to market value.
and when the company was collapsing they were prohibited from pulling their money out
During the time when Enron stock fell from $85 to $15 they were fully able to pull out. They held on until the stock fell below $15 and the plan administrator froze the plan assets for 60 days.
Again, that was their decision and theyn were informed well ahead of time that the plan would be frozen if the administrator saw fit.
It's possible that one exception may involve mandatory investment of matching company contributions to an employee's 401(k) plan -- in which case the money never really belonged to the employees anyway.
I remember pretty much the same thing, their 401K account we basically company pensions in the form of company stock.