he quote below comes from a 1950 speech given by Senator Margaret Chase Smith:

Those of us who shout the loudest about Americanism in making character assassinations are all too frequently those who, by our own words and acts, ignore some of the basic principles of Americanism.

Source: http://www.americanrhetoric.com/speeches/margaretchasesmithconscience.html

What was the purpose of Senator Smith's speech?

to point out the threat represented by McCarthyism
to justify voting for greater restrictions on immigration
to criticize the president for vetoing the McCarran Act
to argue for the repeal of the Espionage and Sedition Acts