  Helicity is a useful concept both for $AdS_4$ and CFT${}_3$ studies. We work
out the complete $AdS_4/CFT_3$ dictionary for spinning fields/operators in the
spinor-helicity base that allows one to scalarize any $n$-point contact vertex.
$AdS_4$-vertices encode correlation functions of conserved currents,
stress-tensor and, more generally, higher spin currents in a simple way. We
work out the dictionary for Yang-Mills- and gravity-type theories with higher
derivative corrections as well as some higher spin examples and exemplify the
relation to the three-dimensional bosonization duality. The bosonization can be
understood as a simple surgery: vertices/correlators are built via an
EM-duality transformation by sewing together (anti)-Chiral higher spin
gravities, to whose existence the three-dimensional bosonization duality can be
attributed.
