Formed in 2016, the Indigenous-led #NoDAPL movement is the response to the allowance for the Dakota Access Pipeline construction below Lake Oahe, the main water source of the Standing Rock Sioux Reservation and neighboring communities. #NoDAPL pointed out the settler colonial context of the movement along with its heavy policing to protect so-called critical infrastructure. Notably, public policing agencies collaborated with the private security and intelligence company TigerSwan hired by the pipeline’s construction firm ETP. Previous research has either illuminated Indigenous perspectives on the matter (Ekberzade 2018; Estes 2016) or discourses around the weaponization of information and strategies of mis/disinformation to sustain the settler colonial state (Harb and Henne 2019; Schnepf 2019). However, not much research has been done on the role of private security firms in the policing of the movement. Aiming at conceptualizing the role of the PSC TigerSwan while policing #NoDAPL, the theories of settler colonial studies and critical infrastructure protection (CIP) were combined and applied in a qualitative content analysis. Using a settler colonial lens also responds to calls for integrating (settler) colonial perspectives into PACS to uncover the deep roots of conflicts (see Byrne 2018). The analysis discusses the symbiosis of settler colonial domination and CIP and TigerSwan’s role as a threat entrepreneur.