The "Alaskan Bush People" star was granted a temporary civil protection order against a man who was allegedly part of the private search and rescue group that found Matt's body, according to Us Weekly.
Bear alleges the man "vaguely claims to have been a very close friend of my brother" but insists he doesn't know him beyond his help in the search.
The reality star says the man "incessantly attacked" him online and on social media since the hunt for Matt ... who died by suicide in May.
Bear alleges the man's made "increasingly unhinged" videos on social media that he says are "spewing hate, and vitriol against my family."
He even cited one alleged post from July 1 that he says made him "afraid for my life."
Bear is asking for a full protection order against the man ... and a hearing is scheduled for later this month.
He's not just seeking protection for himself -- he wants additional orders for his ex-wife, Raiven, his mother Amora, his brothers Noah, Josh, Gabriel, and his sisters Snowbird and Rain.
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