But against his own internal enemy it was much more effective. (politics.co.uk)
In particular, Corbyn must look out for three types of internal enemy: (totalpolitics.com)
Recep Tayyip Erdoğan, the country's president, has been turning Turkey into an Islamist - tinged autocracy, purging the military and other state institutions of perceived internal enemies and jailing thousands of journalists, professors, civil society leaders, and political opponents. (fortune.com)