<human>: Could you distill the essence of the text into 1-3 sentences?

So I have a very strange workplace that I plan to leave very soon.  I should be giving my two weeks any time now.  I am the only one that works in the office, with the exception of a receptionist who works very part time and my married bosses.  Everyone else works in the field on large pieces of equipment as operators.  Today I was part of a meeting where my bosses made some very concerning statements, and I'm curious if this is legal.

It is not uncommon to have 16+ hour shifts 6 days a week in this company.  They discussed how long of shifts and how far from home they can get three specific employees to work before they quit.  They did name names.  They also discussed putting them in the hardest to work locations, with no assistance, a 4+ hour drive for their home base.  Anything over 2.5 hours away requires a hotel stay, and these would be 6 days a week schedules.  Every one of these guys have small kids and wives.  I work with payroll, and have entered 30 hour shifts before, with no sleep during that span.  The number of hours worked and need for sleep are not regulated by the government agency that regulates this industry.

Is this constructive dismissal?  If so, could I provide evidence on these employees behalf in any way if they do quit and file for unemployment?  Would I be doing anything illegal if I tipped off the guys that this was management's plan, so they can go ahead and start looking for other jobs?  I am not worried at all about making sure I keep my job, see [here] and [here] for context.

Because I know state law matters, the company does work throughout the Southeast, including but not exclusive to these states: Georgia, Florida, South Carolina, North Carolina, Virginia, Maryland, West Virginia, Kentucky, Tennessee, Alabama, Mississippi, Louisiana and Texas.
<bot>: Bosses trying to get 3 employees to quit using long hours, distance from home, and rough work.  Legal?