McCarthyism was supported by a variety of groups, including the American Legion and various other anti-communist organizations. One core element of support was a variety of militantly anti-communist women's groups such as the American Public Relations Forum and the Minute Women of the U.S.A.. These organized tens of thousands of housewives into study groups, letter-writing networks, and patriotic clubs that coordinated efforts to identify and eradicate subversion.
Although far-right radicals were the bedrock of support for McCarthyism, they were not alone. A broad "coalition of the aggrieved" found McCarthyism attractive, or at least politically useful. Common themes uniting the coalition were opposition to internationalism, particularly the United Nations; opposition to social welfare provisions, particularly the various programs established by the New Deal; and opposition to efforts to reduce inequalities in the social structure of the United States.
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Why does this all sound so familiar?
There is also a cartoon on the right. Does that also look familiar to anyone.