Sec. 8. [§ 158.] (a) [Unfair labor practices by employer] It shall be an unfair labor practice for an employer,

(1) to interfere with, restrain, or coerce employees in the exercise of the rights guaranteed in section 7 [section 157 of this title];

(2) to dominate or interfere with the formation or administration of any labor organization or contribute financial or other support to it.

(3) by discrimination in regard to hire or tenure of employment or any term or condition of employment to encourage or discourage membership in any labor organization.

 (4) to discharge or otherwise discriminate against an employee because he has filed charges or given testimony under this Act [subchapter];

(5) to refuse to bargain collectively with the representatives of his employees, subject to the provisions of section 9(a) [section 159(a) of this title].

RIGHTS OF EMPLOYEES

 Sec. 7. [§ 157.] 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].