http://www.flickr.com/photos/sovietreality/ better versions you can find by rones: http://www.openclipart.org/detail/161821/labor-poster-fixed-by-rones http://www.openclipart.org/detail/161827/labor-poster-are-drawn-anew-by-rones vintage soviet poster Vintage Soviet Poster
A fist clenched on a nucleus of uranium, with energy radiating from it. A metaphor for the human achievement of releasing nuclear energy. atomic nuclear energy Atomic Fist