I woke up to this thought, after dreaming of a gang member doing gang signs with his hands:
"Gang symbols are not bad in and of themselves. They show you are a part of something bigger than yourself. It's the practices and principles of the gang that will get them in trouble."
We don't, necessarily, need to pray for the organization or brotherhood of gangs to be destroyed, but for their principles and practices to change. Pray that the Motivations, Goals and Methods of the gang's leaders change from evil to good as God touches their hearts and draws them to Him.