Incident at the Mosque

L.A. Times with report tonight that older Boston bombing suspect got kicked out of his mosque just three months ago for shouting at the Imam--for the sin of praising Martin Luther King Jr. as someone to emulate.  Tamerlan complained that MLK Jr. was not even Muslim.  As per other stories, sources described brother as chill but Tamerlan as troublemaker.  Too many punches to the head, or something.  But what was that something?