How did Patriots not know?

Many “red” flags 

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The questions are many as to when the Patriots got information regarding the activity of Aaron Hernandez . It seems like it was the worst kept secret in Foxboro that he was still just a street thug gang member. Critics will have a field day with questions over how much they knew. The story will get worse Did they know he was a gang member? Last July it is possible Aaron Hernandez was involved with a double murder, yet he was rewarded in August  andKraft even mentions the tats.

He has that killer instinct 

Is that a gang signal?

He must have loved the throwback Red Jersey