There is shockingly little information on the hammer and sickle symbol available.  Obviously the hammer represents toe workers and the sickle the farmers, but other than that there isn't a lot.  I did find out that Sickle is a company that sells rock climbing clothes.  Seems like every rock climber I know wears whatever crap clothes they have on hand and usually look like they just got back from Burning Man (that last reference was crowbared in as a nod to my good friend John).  I guess I don't hang out with the right kinds of rock climbers.  Also , Hammer Films is a company that does some b horror movies.  The site is well worth checking out.