  We report flocking in the dry active granular matter of millimeter-sized
two-step-tapered rods without an intervening medium. The system undergoes the
flocking phase transition at a threshold area fraction ~ 0.12 having high
orientational correlations between the particles. However, the one-step-tapered
rods do not flock and are used as the motile dissenters in the flock-forming
granular matter. At the critical fraction of dissenters ~ 0.3, the flocking
order of the system gets completely destroyed. The variance of the system's
order parameter shows a maximum near the dissenter fraction f ~ 0.05,
suggesting a finite-size crossover between the ordered and disordered phases.
