 Complete the following phrase:  Somalias al-Shabaab and its Islamic extremism can be traced back to the mid-1970s when the group began as an underground movement opposing the repressive and corrupt regime of Siad Barre. Armed conflict between al-Shabaab and the Somali army  including associated human rights violations  has resulted in slightly over 68 million human displacements. Al-Shabaab is hostile to Sufi traditions and has often clashed with the militant Sufi group Ahlu Sunna Waljamaa. The group has also been suspected of having links with Al-Qaeda in Islamic Maghreb and Boko Haram. Among their best-known attacks are the 