Through OSHA (Occupational Safety and Health Administration). I.E. viewing unvaxxed employees as making the workplace unsafe. Businesses that don't comply will be fined.
Patriots should have fought hard against OSHA in the first place, because the whole concept violates the Constitution directly.
"A senior administration official estimated that this new OSHA requirement will cover about 80 million workers and businesses that do not comply with the agency’s rule can face substantial fees"
That very same OSHA was violated when employees were mandated to wear masks all day, restricting oxygen and building up bacteria. They should have been given fresh respirators every hr or so by the employers if they were mandated