Yes, that is from The Great Dictator. He played a dual role: Adenoid Hinckel, Chancellor of Ptomainia, whose flag is the sign of the double cross. Not hard to figure out who he's lampooning. In this scene, he is The Jewish Barber, who happens to look just like Hinckel, and is mistaken for him.

Great stuff. I also love the scene where Hinckel is giving a speech to an adoring crowd of tens of thousands. "Americanish -- SHTUNK!" he roars. Cheers. "Democrashun -- SHTUNK!" More cheers. He then goes into an incredible Hitler parody, at one point, the microphone in front of him tries to bend to get as far from him as possible.

And of course there's the scene where he lovingly does an acrobatic dance with a balloon-like globe which he caresses as he fantasizes about being ruler of it all -- until it blows up in his face.

Oh, and the scene where he's getting a hiarcut with an actor who is portraying a thinly-disguised Mussolini. One of them notices his chair is a little lower than the other, so he jacks it up a bit, then the other does the same and they are both trying to be a little higher than each other all the way to the ceiling.

I believe it was the first movie he made that wasn't silent. He held out throughout the 1930s and finally gave in to make this portrayal. Even at that, there are short silent sequences in the film.

If you've never seen it, I heartily recommend it.