Possible Clues:

• Avoids directly answering criminals
• Yard surrounders
• 'Good ......make good neighbours'
• 2016 Denzel Washington/Viola Davis film whose title refers to real and metaphorical barriers
• Kind of barriers, or dealers in stolen goods
• Fights with an epee
• They may well surround receivers
• The receivers put them up to keep one out
• With them one foils the receivers and keeps them out
• Might it make them pale to dispose of the swag?