A map of south Africa showing location of coal burning power plants​

The investiture controversy began as a power struggle between pope gregory vii (1072–85) and henry iv, holy roman emperor (1056–1106).[2] a brief but significant struggle over investiture also occurred between henry i of england and pope paschal ii in the years 1103 to 1107, and the issue played a minor role in the struggles between church and state in france, as well.by undercutting the imperial power established by the salian emperors, the controversy led to nearly 50 years of civil war in germany, and the triumph of the great dukes and abbots. imperial power was finally re-established under the hohenstaufen dynasty. historian norman cantor:

Answergranulation;

The answer is i believe low birth rights.hope my answer is the one you are looking for : )

The were examples of police  brutality  and prideful people. police brutality because they could have acted differently. and prideful people because even if you are treated wrong you should still humble your self to the law that is before you.