How to deport someone that is an actual threat to my family ?

For context and sorry for posting so much but I need help on how to deport or report an immigrant. This said person has harassed my family for a while. How do I call ice and what else can I do and why are the steps to take? Links and resources and numbers would be appreciated. And if u work with border patrol or know someone and actually want to make a difference for America, CONTACT ME BECUASE I KNOW A TRULY BAD PERSON WHO SHOULD NOT BE IN AMERICA