>Employees shall have the right to self-organization, to form, join, or assist labor organizations, to bargain collectively through representatives of their own choosing, and to engage in other concerted activities for the purpose of collective bargaining or other mutual aid or protection, and shall also have the right to refrain from any or all of such activities except to the extent that such right may be affected by an agreement requiring membership in a labor organization as a condition of employment as authorized in section 8(a)(3) [section 158(a)(3) of this title].

Unless I'm reading this wrong, it means that employers have no ability to stop their employees from forming a union, to fire them for forming a union and to hire non union employees without the unions approval. I can understand such regulations in socialist countries like India (where other than IT, most industries do have strong unions, with legal and politican support). However it seems to be against the image US projects