A letter to Mr. Vincent Astor from Mr. Upton Sinclair -- Reply of Mr. Astor to Mr. Sinclair -- A second letter from Mr. Sinclair -- Mr. Sinclair's distorted views of social conditions / by a trade unionist -- Upton Sinclair's mental marksmanship / by Samuel Gompers -- Appendix. Constructive trade unionism, its wonderful achievements--told by those who know -- President Gompers' report to the International Secretariat.