Herbert Merrill graduated from Plymouth High School and began his career as an armature winder at a major manufacturing plant, where he also founded a local union. He spent several years in the private sector before transitioning to public service, where he held various elected positions over three decades. Merrill was a long-standing advocate for workers' rights, serving as Secretary of the Socialist Party in New York for about 15 years and consistently supporting unionization and public ownership. His educational background and reading habits were notable, with one academic leader describing him as exceptionally well-read for his time.

Herbert Merrill's political identity is marked by a lifelong commitment to workers' rights and unionization, rooted in his early labor activism. His ideological stance aligns closely with the Socialist Party's emphasis on public ownership and cooperatives, yet his legislative efforts often reveal unexpected alliances with opposing factions. Merrill's rhetorical style is deeply informed by his extensive reading and intellectual engagement, which positions him as a uniquely informed and articulate advocate for his causes.