I honestly don't know why we try to go after executives at all. It's proven ineffective since you can never mount enough evidence to get a real case and the fines are just seen as a cost of doing business for the company. Instead you need to create labor laws that are enforced in much the same was as moving violations are enforced for driving.

For example, if you are hired as a driver for a delivery company, you, the driver, are responsible for speeding or running stop signs and red lights, not your employer. You never here about a manager telling their employers to speed and retaliating against those that don't speed to make a delivery. On the surface, similar laws may appear to victimize the people at the bottom, but it instead does something very very important. It's places a firm barrier across which almost all workers will push back from since they are the ones that will be left holding the bag when law enforcement shows up and starts handing out fines.

So in the original article, they could create a law that fines the manager some multiple of the amount that every one of those laborers lost. Let's say it is 15 minutes work times 30 employees at $12/hour. That's $90 dollars in lost pay. Now make the fine 10x that value plus court costs and lawyer fees and now every single manager is going to think twice before willingly victimizing these temp workers, and will question their bosses when asked to do things like this.

Laws that make illegal these unethical actions with very real victims would empower workers to stand up for their rights better than anything else. No one would ever have to stick his or her neck out, they can just call the cops anonymously and tip them off to unethical business practices. The enforcement of violations would be handled right there on the spot without ever involving the legal department of the corporation responsible for the abuse.