All of those dastardly plans of poll watchers (intimidators) and closed polling places would be for naught.

The OSHA general duty clause, Section 5(a)(1) of the Occupational Safety and Health Act, requires that each employer furnish to each of its employees a workplace that is free from recognized hazards that are causing or likely to cause death or serious physical harm.

From OSHA.gov/workers/

Under federal law, you are entitled to a safe workplace. Your employer must provide a workplace free of known health and safety hazards. If you have concerns, you have the right to speak up about them without fear of retaliation. You also have the right to:

Be trained in a language you understand
Work on machines that are safe
Be provided required safety gear, such as gloves or a harness and lifeline for falls
Be protected from toxic chemicals
Request an OSHA inspection, and speak to the inspector
Report an injury or illness, and get copies of your medical records
See copies of the workplace injury and illness log
Review records of work-related injuries and illnesses
Get copies of test results done to find hazards in the workplace