Church and Scripture

Out text book focuses more on the teachings and lessons of the church.  But when it comes to "social justice" I had to look for the words.  Having gone to a catholic grade school and now high school, I have heard almost about every aspect of the church.  I have never heard of Catholic Social Teaching though.  I understand that the church is trying to solve the social injustices of the world but I want them to make it more public.  Of course we hear about the Sisters and Fathers who are doing wonderful works for social justice but the Church is supposed to be "One".  How can we be one if we are doing out acts of justice individually?  The teachings of the church are important but to solve the injustices of the world, we must act as one.