Mc·Car·thy·ism 
(mə-kärthē-ĭz′əm)
(mə-kärthē-ĭz′əm)n.
1. The practice of publicizing accusations of political disloyalty or subversion with insufficient regard to evidence.
2. The use of unfair investigatory or accusatory methods in order to suppress opposition.
[After Joseph Raymond McCarthy.]
Mc·Carthy·ist n.