Marvin Gaye referred to "Trouble Man" as the "most honest" song he ever wrote. It was the title track for a film that was known mainly for this amazing song.
By the time Gaye recorded this in 1972, he had broken completely free of the Motown formula and was making some of the most innovative music of the time, combining a great deal of jazz with his soul / pop sensibilities and deep soul vocals. He wrote and produced the song, and played many of the instruments on the studio version.
I can't locate the date or location of this live version (help anyone?), though I am guessing it is later in the '70's. Terrific stuff, with a particularly tasty sax solo towards the end.