I think that would be news to most employers in the US, mainly because it appears to not be true and the details vary wildly by state

https://www.workplacefairness.org/voting-rights-workplace

"In some states, the law designates a specific amount of time that workers must be allowed off to vote. ... Some states require your employer to give you time off only if you will not have enough time to vote before or after work, while the polls are open. Most but not all states prevent your employer from firing or disciplining you because you take time off to vote."

In the state I live in, there is no law requiring your employer to give you time off to vote.