I intend to do what little one man can do to awaken the public conscience, and in the meantime I am not frightened by your menaces. I am not a giant physically; I shrink from pain and filth and vermin and foul air, like any other man of refinement; also, I freely admit, when I see a line of a hundred policemen with drawn revolvers flung across a street to keep anyone from coming onto private property to hear my feeble voice, I am somewhat disturbed in my nerves. But I have a conscience and a religious faith, and I know that our liberties were not won without suffering, and may be lost again through our cowardice. I intend to do my duty to my country.

Upton Sinclair (1878-1968) American writer, journalist, activist, politician

Letter to the Louis D. Oaks, Los Angeles Chief of Police (17 May 1923)
    (Source)

Reprinted in his Autobiography (1962).