As we mentioned earlier, there were an unknown, but large number of FBI agents operating under cover at last Saturday's demonstration in Washington D.C. This photograph of what are presumed to be some of them was later memed by Lawdog.
One of Michael Yon's legion of supporters has apparently done his homework. He found a photograph of very similar-looking people participating in what appears to be a gay pride parade, wearing FBI T-shirts. This morning, the following appeared on Yon's feed.
Found this on Twitter - idk but it's kind of a coincidence.
Click the image for a much larger view, to see the lines connecting individuals in both photographs.
Not proof positive, as far as I'm concerned, but a very strong indicator.