It’s infiltration because they’re doing it to further their aims by subverting those* of organisations they’re joining. The Internet means that planning and rad

It’s infiltration because they’re doing it to further their aims by subverting those* of organisations they’re joining. The Internet means that planning and radicalisation can happen without ever being explicitly targeted by organised extremists. Hence self-infiltration much like the Islamist terror attacks carried out by self-radicalised people. * - Nominally at least.