An all-black inner city school has to become an integrated school. Few dozen white kids are transfered there, but the black students are aggressively opposed to this. The school then approaches a tough black teacher for help.
One of many films in the early 1970s dealing with race relations and social changes. You have a predominately African-American high school being integrated by white teens. There are also teachers and their trials and tribulations with knucklehead students. I believe this is one of the earliest films Jeff Bridges starred in as an adult (he was one of the students).