Original sentence: Alfredo Scappaticci, allegedly the agent known as Stakeknife.Gardaí said they had been aware of his presence since January and they had warned him of a threat to his life.He was the second in command of the IRA's Internal Security Unit, an elite group of IRA volunteers who sought out, interrogated and killed suspected informers
Edited sentence: Alfredo Scappaticci, the agent known as Stakeknife.Garda said they had been aware of his presence since January and they had warned him of a threat to his life.He was the second in command of the IRA's Internal Security Unit, an elite group of IRA volunteers who sought out, interrogated and executed suspected informers