listom

1. (usually of people) to a man; all without exception
   Radnici su listom stupili u štrajk. — The workers went on strike to a man.
   Kritičari su listom pohvalili novi film. — Critics unanimously praised the new film.
   Selo je listom stalo uz svog gradonačelnika. — The village stood behind its mayor to a man.

Usually goes with a plural or collective subject.