Violence... The story so far

Links defining known terror organizations:

Defense link - US military listing Global Terror Primer
Counter Terror Archive "A Summary of Worldwide Terrorism Events, Groups, and Terrorist Strategies and Tactics.

Terror Group Listing

As of Jan 2002, the U.S. State Department has identified the following foreign terrorist organizations:

Abu Nidal Organization (ANO)
Abu Sayyaf Group
Al-Jihad (Egyptian Islamic Jihad)
Al-Qaida
Armed Islamic Group (GIA)
Aum Shinrikyo
Basque Fatherland and Liberty (ETA)
Gama'a al-Islamiyya (Islamic Group)
Hamas (Islamic Resistance Movement)
Harakat ul-Mujahidin (HUM)
Hezbollah (Party of God)
Islamic Movement of Uzbekistan (IMU)
Kahane Chai (Kach)
Kurdistan Workers' Party (PKK)
Liberation Tigers of Tamil Eelam (LTTE)
Mujahedeen Khalq Organization (MEK)
National Liberation Army (ELN)
Palestinian Islamic Jihad (PIJ)
Palestine Liberation Front (PLF)
Popular Front for the Liberation of Palestine (PFLP)
Popular Front for the Liberation of Palestine-(PFLP-GC)
Real IRA
Revolutionary Armed Forces of Colombia (FARC)
Revolutionary Nuclei (formerly ELA)
Revolutionary Organization 17 November
Revolutionary People's Liberation Army Front (DHKP/C)
Shining Path (Sendero Luminoso, SL)
United Self Defense Forces of Colombia (AUC)

See: Extremism and Suicide Terrorism for what attracts the young Muslims to these activities.