To grossly oversimplify things, the conservative view is that corporations are good and unions are bad. To use one example, the governor of Wisconsin is busy lowering taxes for corporations while trying to reduce or eliminate the collective bargaining rights of state employees.
In some ways the dislike of unions is historical in origin. Unions were often associated (in reality or in the minds of the corporate types) with Communists and anarchists. Unions are, obviously enough, almost always considered left wing in nature. After all, they tend to support the workers rather than the businesses. This, of course, gives folks who are for corporate profits a good reason to oppose unions-unions often push companies to pay more, to provide more benefits and to not employ child or slave labor.
Interestingly enough, corporations and unions can actually be seen as being essentially the same. First, both are organizations that aim at benefiting their members. Corporations aim to maximize profits while unions aim to maximize the benefits for their members. They both organize to do this, although corporations rely primarily on financial power and unions rely more on weight of numbers. Second, both are often harshly criticized for trying to do what they are supposed to do-at least when they go too far. Corporations are typically attacked for trying to maximize profits via means that are regarded as wrong-such as exploiting workers, cutting corners in safety and so on. Unions are most often criticized for trying to get as much as they can from corporations and this is seen as harming the corporation in particular and the economy in general.
In terms of the classic stereotype, corporations are supposed to dream of having slave laborers toiling around the clock in horrible conditions while toxic waste is spewed into the very mouths of spotted owls. Unions, of course, are supposed to crave a world in which corporations funnel all their money to the workers, who show up only to collect their pay and to pilfer office supplies.
While these stereotypes do not generally match reality, there are legitimate grounds to be critical of corporations and unions. Both have done and will do bad things that harm the general good. However, both also provide goods that are worth having. Corporations provide a means by which people can organize in order to make money. Unions provide a means by which people organize to prevent themselves from being exploited and mistreated by those who wish to make money. Ideally, the two would serve t0 balance each other-the corporations would work to keep the unions from becoming too excessive while unions do the same for corporations.
While it is easy (and often fun) to blast corporations or unions, it is well worth considering the value of each and the need to have both. At least for the time being.