Practitioners and critics alike often attribute great authenticity to documentary theatre, casting it as a salutary alternative not only to corporate news outlets and official histories but also to the supposed "self-indulgence" and "elitism" of avant-garde theatre. Documentary Vanguards in Modern Theatre, by contrast, argues for treating documentarians as vanguardists who (for good or ill) push, remap, or transgress the margins of historical and political visibility, often taking issue with professional discourses that claim a monopoly on authoritative representations of the real. This is the first book to situate documentary theatre's development within the larger story of theatrical experimentalism, collage art, collective ritual, and other avant-garde dramaturgical and performance practices of the late 19th and 20th Centuries.