Sure it can. Laissez-Faire only applies to legal and governmental prevention of another company's business. These SOPA and PIPA bills are a perfect example of how we can be capitalist and a corporatocracy at the same time. I'll use the RIAA as an example:
The RIAA doesn't want you to give money to anyone but the RIAA. That is the only thing that it cares about. It is, after all, a business. It can't have the government stop you from giving money to others, because that would be obstruction of Laissez-Faire. It can, however, stop or limit your exposure to anything except properties that gain the RIAA money. This can be done by disguising SOPA and PIPA as "noble bills" that are there to stop people from pirating music from their artists. This is fine, but beyond that, they could potentially shut down any site that even has the capability of sharing pirated content. That means that in addition to keeping you from sharing RIAA artists' music, it would also keep you in the dark as to new, independent content.
The music industry is just a small example, but this also applies to any sort of trade. In the physical world, imagine that say, Macy's, owns every building on a city block except one. The small, independent clothing shop located there will not sell. But, Macy's needs the real estate to build a new store. They can't directly get involved in the shop, but they can use underhanded tactics to get around it. Maybe they search for, and report any sort of building code violations. This has the potential to get the small store shut down, without directly becoming involved with the sales end of the business.
So again, Capitalism doesn't imply that we have Laissez-Faire. We just happen to have both.