Sentence:  The third faction — the TI — sought to steer a middle course between the GPP-TP debate using the strategic concept of <WSD>insurrectionalism</WSD>, which asserted that before a Marxist-Leninist state could be established the revolution had to pass through a democratic-popular stage. 
Meaning of the word marked with <WSD> tags:  The belief that insurrection is the best way to achieve a communist or socialist revolution.