How Terrorist Groups End Of the 648 groups that were active at some point between 1968 and 2006, a total of 268 ended during that period. Another 136 groups splintered, and 244 remained active. As depicted in the figure, the authors found that most ended for one of two reasons: They were penetrated and eliminated … Continue reading Rand Corporation: ‘War on Terror’ works only 7% of the time.