"Rogue elements" refers to individuals or parts of a group that behave in a reckless, uncontrolled, or independent manner, deviating from the desired or accepted norms or principles of the group. Full definition
Twelfth was the abduction of the Chibok girls in 2014 which was planned, funded, executed and orchestrated by rogue elements in our intelligence agencies in collusion with some disgruntled northern politicians and key members of the then opposition including three sitting governors. (dailypost.ng)
For those who don't know what Killing Floor 2 is; players descend into continental Europe after it has been overrun by horrific, murderous clones called Zeds that were created by rogue elements of the Horzine Corporation. (coin-drop.com)
Another reference point was the earlier attempt by rogue elements in the security service to destabilise the Wilson Government, and the possibility of a coup d'état in which Lord Mountbatten would become interim prime minister. (telegraph.co.uk)