When people vote more than once what illegal activity are they engaged in?

I believe the answer is: Election fraud

Election fraud refers to every actions made during the election process that initiated  in order to make interference toward the final result numbers of the election, In united states, people who are convicted with election fraud could face up to 5 years of jail time.

Freedom of religion, freedom of speech, being protected by our military and first responders on a daily basis and many many more.