What two groups made up the crowd that waited outside the federal arsenal?

The raid on Harper's Ferry was an intent by John Brown, who was an abolitionist, to initiate a slave revolt in 1859 by taking control on the federal arsenal located in Harper's Ferry, Virginia.

The two groups that were outside the arsenal were:

The attempt was unsuccessful, resulting in the defeat of Brown's group by the US Marines.

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it refers to race, i am pretty sure this was a popular term in nazi germany or something.