Black Panther Party = 74
White Supremacist = 74
7, the 4th prime (7th month, July)
The date of the march was one with 71 numerology, a number we see coded around 'African American' history often.
7/28/1917 = 7+28+19+17 = 71
This is the year 100-year anniversary. Hundred = 74
African American = 71 / 100
Notice they marched along 5th Avenue.
Five = 42
They started at 57th.
Scottish Rite = 57