Did Barrigan know Sullivan was a mole before Sullivan’s arrest on the rooftop?
Or did Barrigan put the pieces together when Brown most likely asked him to back him up after Costigan called him to support his arresting of Sullivan.
shareI’m thinking he knew. Costello probably had Barrigan keep an eye on Sullivan to ensure he was staying loyal. It seemed the higher up in rank Sullivan got the less Costello trusted him.
shareThat sounds right.
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