Here ya go. Both the source he used and a second one, in case you could argue that Yahoo is not reliable.
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https://www.yahoo.com/lifestyle/maga-marchers-proud-boys-descend-164500443.html?guccounter=1&guce_referrer=aHR0cHM6Ly93d3cuZ29vZ2xlLmNvbS91cmw_c2E9dCZyY3Q9aiZxPSZlc3JjPXMmc291cmNlPXdlYiZjZD0mdmVkPTJhaFVLRXdqTW8tTy0xTlR0QWhWQ1Zob0tIWVFhQ21BUUZqQUFlZ1FJQWhBQyZ1cmw9aHR0cHMlM0ElMkYlMkZ3d3cueWFob28uY29tJTJGbGlmZXN0eWxlJTJGbWFnYS1tYXJjaGVycy1wcm91ZC1ib3lzLWRlc2NlbmQtMTY0NTAwNDQzLmh0bWwmdXNnPUFPdlZhdzJVbUhPU3dUdHplYlVtYThvYk9pYVI&guce_referrer_sig=AQAAAHaelAlN02NAAhG7clpUbPp4NrfxsEPULABD5t-pUBQs5ko0EoFlKfeqV9hKrZ_QpRS8fzYGa1-i9nwm3kd5bfqydaq9_jj86CrEvgyZ5g59-my0gScUk9WEqWgU5HH6WnM5nV0_1aabxqSWTqc2waDrvCn8QqmuFNu00D2Ivte8
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https://www.washingtonpost.com/local/public-safety/proud-boys-protest-stabbing-arrest/2020/12/13/98c0f740-3d3f-11eb-8db8-395dedaaa036_story.html