Untouchability
The term has also been used to refer to other groups , including the "Burakumin" of Japan , the Baekjeong of Korea , and the Ragyabpa of Tibet , as well as the Romani people and Cagot in Europe , and the Al-Akhdam in Yemen Traditionally , the groups characterized as untouchable were those whose occupations and habits of life involved ritually "polluting" activities , such as fishermen , manual scavengers , sweepers and washermen . 
<triplet> Al-Akhdam <subj> Yemen <obj> country