Political correctness - silencing people

Political correctness is a tool to silence people and prevent them from telling the truth.

History:
"In the early-to-mid 20th century, the phrase "politically correct" was used to describe strict adherence to a range of ideological orthodoxies"
"...This usage referred to the Communist party line which, in the eyes of the Socialists, provided "correct" positions on all political matters...."
"In the 1970s, the American New Left began using the term "politically correct".
"The term "politically correct" was used infrequently until the latter part of the 20th century. This earlier use did not communicate the social disapproval usually implied in more recent usage." (Wikipedia)