Pretty much. The idea is that capitalism forces companies to create goods at the cheapest possible price. Eventually, this means the company will rely on outsourcing labor to a country with less-than-stellar human rights conditions. For instance, we all know how shit most Chinese factory labor conditions are. Now think of just how many things you find are “made in China” stamped.

At the most undeniable level there’s that. You can also take the approach that any kind of profit that a company is making, they’re only making off the labor of their workers. That profit, thus, should belong to them, not the capital owners. This position is a bit tougher to argue, but it’s also valid.