You could be an independent laborer, or you could maybe work in something like a co-op where workers have a direct fair share of profits, but the business structure in which your boss completely owns the fruits of your labor because he owned the machines and paid you a wage related more to ease of replacing you than the value you produce would not be allowed, so there would be nobody to sell your labor to in the conventional sense, but you could collaborate and contribute your labor to something you actually got an equitable share of profits from. Communists would point out that you've sold your labor for less than it's worth in every single job you've ever held because that is the inherent nature of wage labor under capitalism. Your boss will only ever hire you if he thinks you will produce more value than the wage you agree to because that's the only way he can generate profits for himself. Anything else would make them no money or cost them money and therefore be bad business.