Social criticism was also addressed ("Black and Blue" on "Messin"' dealt particularly with slavery and "Chicago Institute" on "Watch" with mental institutions and science as a means of social control); a trend which grew throughout the 1980s, with songs such as "Lies (Through the 1980s)" on technological progress vs. social setbacks on "Chance" (1980), and with Mann's growing involvement with the anti-apartheid movement which was featured on the 1982 album "Somewhere in Afrika". Mann's intention for acknowledgement of oppressed ethnic groups also influenced the 1992 album "Plains Music", which featured traditional Native American music.