Together Brothers

I was born in 1964 and "Together Brothers" was one of the first movies I saw in The Fox Theater in downtown Detroit after riding the bus at the age of 10 yrs old. This movie has never left my memory. I bring it up in conversation with people who came up in the same era to see if they remember and I've yet to run across anyone who remembers the movie. I was in the movie theater with my oldest brother (only 4 years older than me) and I can remember being a little afraid because the movie was dark and "a bad man" was after a little boy. I also remember feeling a little pride (for a 10 yr old) in the boys for trying to find the man who killed the police officer. I've been trying to find information on the movie in order to purchase it. I've been all over the Internet but run into dead ends. The closest I come to any information is the sound track from Barry White and the Unlimited Orchestra. Is there anyone out there who can help me?