Intelligence analyst Sam Lichtenstein, who closely monitors extremism, said despite their different beliefs, hate groups often come together online and talk to each other. The danger, he said, is someone who gets connected to one hate group is often quickly exposed to many.

"They are able to take inspiration from one another and share ideas," explained Lichtenstein, who works for RANE Network, a private intelligence company. "This comingling of extremist narratives that can really further someone towards violence."

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Read the full CBS News Texas by Brian New here.