You need to report these communications to facebook. It also sounds like this should be reported to the police. These threats are intimidating you to not live your life.
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Keep reporting every single incident to Facebook. Call the non-emergency number of your police department and report this, if they want, they can investigate and take action, and hire a local lawyer to send a cease and desist letter to every one of these individuals. That will probably get their attention.
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Facebook has policies to deal with this. Report them. You have to understand that Facebook probably gets several of these each day, so give it a bit of time for them to catch up with it.
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