The excellent THEODORE ROOSEVELT AN AUTOBIOGRAPHY, the Republican candidate for Vice-President of the Republican Party in 1900 tells,
…the monotony usually attendant upon such a campaign of political speaking was diversified in vivid fashion by occasional hostile audiences. One or two of the meetings ended in riots. One meeting was finally broken up by a mob; everybody fought so speaking had to stop. Soon after this we reached a town where we were told there might be trouble. Here the local committee included an old and valued friend, a “two-gun” man of repute, who was not in the least quarrelsome, but who always kept his word. We marched around to the local opera-house, which was packed with a mass of men, many of them rather rough-looking. My friend the two-gun man sat immediately behind me, fixing his gaze with instant intentness on any section of the house from which there came so much as a whisper. The audience listened to me with rapt attention. At the end, with a pride in my rhetorical powers which proceeded from a misunderstanding of the situation, I remarked to the chairman: “I held that audience well; there wasn’t an interruption.”
To which the chairman replied: “Interruption? Well, I guess not. Seth had sent around word that if any son of a gun peeped he’d kill him!”
Chapter 4, p. 129-130; New York, DA CAPO, 1985.