That's another example, but not the one I was thinking of. I clearly remember the photo, and yet it seems impossible to find on the internet. Closest thing I could find is this one, but it's Mao instead of Stalin:
https://11points.com/wp-content/uploads/2011/11/maofuneral.j...(From https://11points.com/11-famous-doctored-photos-dictators/)
Perhaps I'm misremembering after all and it was always Mao instead of Stalin.