This method of expressing concern to a senior human resources manager about an instance of illegal employment through proper channels is known as <u>opposition</u>.
A human resources manager has a lot of functions such as, selecting employees, recruiting, inducting employees, providing orientation, imparting training, appraising the performance of employees, motivating employees, giving compensation and benefits, etc.
So in an organization, if there are any concerns regarding, for instance illegal employment, then the human resources manager is approached. Thus, this method of expressing concern through proper channels is known as opposition.
Hence, the opposition is a disagreement with something, often by speaking or fighting against it.
To learn more about human resources manager here:
brainly.com/question/27956348
#SPJ4