Found something in the linked police report by Crowley. The 911 caller meets him at the house, Gates quotes her telling him "she observed what appeared to be two black males with backpacks".
That's it I think. The source of Gates charge of profiling by her.
Police Report
Yea, but Gates says it was in the 911 call.
What a completely stupidly remark Gates made when he said it was in the 911 call.
Stupidly stupidly stupidly!