As the old saying goes, "Desperate times call for desperate measures," and there are few times more desperate for a majority of laborers living hand-to-mouth, than being put out of work en masse. Adamic's well-researched, but surprisingly easy-to-read (I read it over a long weekend) book demonstrates the desperate side of the labor struggle which is rarely, if ever, taught in classrooms.
As strikes and "riots" are often portrayed in the media as unprovoked violence against the employers or scab workers, and haphazard destruction of the employers' properties, Adamic will not let the reader ignore that in many (most?) cases, it is the the monopolists and the concentrated Big Business who are directly responsible for the opening salvo (i.e., hired thugs to bust the strikes, agents provocateurs, corrupt politicians, etc.). He also notes that while many attempts at labor organizing were demonized and even prosecuted as illegal interference with commerce, etc., the duplicitous nature of the American legal system often ignored equally heinous interference with commerce when done on behalf of organized Big Business.
Adamic is unabashedly anti-capitalist, so his character descriptions tend to favor the champions of labor, and make the enemies of labor seem characteristically repugnant. That said, he keeps a fairly even keel and is not afraid to highlight labors shortcomings, infightings, especially weak leadership, a "We'll get ours and damn the rest" mentality, failures of the AFL as well as the politicking and racketeering scandals which plagued early labor organizations and it would seem, doomed them for the future.
Although he does not explicitly endorse "dynamite" as a means to achieving labor's goals, I think he is without a doubt sympathetic to its use; at least under certain desperate circumstances the majority of which cannot be blamed on the working classes.