Counter-terrorism

Counter-terrorism (also called anti-terrorism) incorporates the practice, military tactics, techniques, and strategy that government, military, law enforcement, business, and intelligence agencies use to combat or prevent terrorism.

If terrorism is part of a broader insurgency, counter-terrorism may employ counter-insurgency measures. The United States Armed Forces use the term foreign internal defense for programs that support other countries in attempts to suppress insurgency, lawlessness, or subversion or to reduce the conditions under which these threats to security may develop.

History

In response to the escalating terror campaign in Britain carried out by the militant Irish Fenians in the 1880s, the Home Secretary, Sir William Harcourt, established the first counter-terrorism unit ever. The Special Irish Branch was initially formed as a section of the Criminal Investigation Department of the London Metropolitan Police in 1883, to combat Irish republican terrorism through infiltration and subversion.