The NY Times has an interesting article on how employer groups are taking a strong stand against worker centers. I hadn't heard of these before, but worker centers are groups which advocate for employee rights without going to the level of organizing workers at the individual employer level.
I don't have enough knowledge to add any insights into the organizations themselves. However, I do think this is an interesting example of how needs drive an institutional response no matter how hostile the economically and politically powerful are to those needs. America has been very anti-union for many decades and there have been a variety of institutional responses, both politically and systemically at the employer level, that have served to greatly weaken unions.
This did not however in any way diminish the need society has for the functions that unions played. Given that our institutions no longer allow unions to fulfill their social purpose it is inevitable that new institutions would develop that would be able to get around the limitations placed on unions. Worker centers seem to be at least one possible form those institutions will take.
The message employers should be getting from this is that there is a social need that needs to be filled and that their activities are actively undermining this need. It is impossible to be successful in this for any length of time and they would be better off coming to terms with the fact that they cannot simply get their way through wielding power. Sooner or later they will have to cede influence to labor, the question is if they want to do this with organized labor, which they have a long history with and can probably reach some form of mutually beneficial symbiotic relationship with, or if they want to role the dice with innovative new organizations that are being formed in response to the social needs going unmet due to their anti-union activities.
Given the often expressed fear of uncertainty I hear about the sensible thing would be to make nice with the unions. I doubt, however, that business groups will be able to acknowledge to themselves that these groups fulfill a necessary social function and will instead take the riskier, and almost definitely worse for everyone, option of rolling the dice and relying on their power instead.