It looks like the workers that were terminated for cause, with no cause care.
As for privately employed roughnecks and pipeline construction workers, you did not show me where they were terminated for cause, in order to deny unemployment and given a negative job reference to make it harder for them to get another job. Did they do it by email in the middle of the night. I doubt it, simply because I do not remember a bunch of contractors getting the sh#t kicked out of them, when they were wrongfully terminated. I have seen contractor fck over construction workers and get their ass kicked, right there on the jobsite. It ain't pretty. Much better to thank them for their good work, pay them everything coming to them, when letting them go.