Karl Marx called religion the opium of the masses. A Catholic bishop warns that extreme socialists and communists in America threaten freedom of religion.
https://www.foxnews.com/opinion/bishop-robert-barron-real-reason-communists-fear-religion-want-believers-silenced
https://www.foxnews.com/opinion/bishop-robert-barron-real-reason-communists-fear-religion-want-believers-silenced