The hammer and sickle is a part of communist symbolism and its usage indicates an association with Communism, Communist Party, or Communist state. It features a hammer superimposed on a sickle, or vice versa. The two tools are symbols of the industrial proletariat and the peasantry; placing them together symbolises the unity between industrial and agricultural workers.
It is best known from having been incorporated into the red flag of the Soviet Union, along with the Red Star. It has also been used in other flags and emblems.( wikipedia.org)