With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: During the 1970s, the Glenanne gang—a secret alliance of loyalist militants, British soldiers and RUC officers—carried out a string of gun and bomb attacks against nationalists in an area of Northern Ireland known as the "murder triangle". It also carried out some attacks in the Republic, killing about 120 people in total, mostly civilians who had no connection to the government. The "Cassel Report" investigated 76 murders attributed to the group and found evidence that soldiers and policemen were involved in 74 of those. One member, RUC officer John Weir, claimed his superiors knew of the collusion but allowed it to continue. The "Cassel Report" also said some senior officers knew of the crimes but did nothing to prevent, investigate or punish. Attacks attributed to the group include the Dublin and Monaghan bombings (1974), the Miami Showband killings (1975) and the Reavey and O'Dowd killings (1976).
text_B: Upon seeing the results of their attacks in the Republic, would the Glenanne gang have considered the operation to be successful in advancing their cause?
NO.