They are rebels working for an illegitimate cause like for example they may rebel against a democratically elected president and want to establish a sectarian state like the Lords Resistance Army in Kenya.
A biased term that liberal media outlets currently use to deliberately distort the perception of a candidate they wish to portray in an negative fashion.
'Insurgent' means 1: in opposition to a civil authority or government; 2: a member of an irregular armed force that fights a stronger force by sabotage and harassment; 3: a person who takes part in...