In the developed world (esp. the US), the hammer and sickle, symbols of labor, are not actually used that widely anymore. Industrial monocrop mechanised agriculture and assembly-line manufacturing processes, as well as the use of robotics means most workers are no longer swinging a hammer or sickle as they produce goods, such as food, for the society. tl;dr: As manual labor has changed in the US & developed countries, does this well-recognized Communist symbol need updating?
I heard a suggestion once that we use an aspen leaf as an American socialist symbol. If you don't know, a grove of aspen trees is connected at the roots. One giant organism sharing resources. As such they're the first to rebound after a fire.