; (B) the impact of the unfair labor practice on the charging party, on other persons seeking to exercise rights guaranteed by this Act, and on the public interest; and (C) the size of the employer. (3) Director and officer liability If the Board determines, based on the particular facts and circumstances presented, that a director or officer’s personal liability is warranted, a civil penalty for a violation described in this subsection may also be assessed against any director or officer of the employer who directed or committed the violation, had established a policy that led to such violations, or had knowledge of and the authority to prevent the violation and failed to do so. (d) Joint and several liability An employer shall be jointly and severally liable under this Act for any violations of this Act involving one or more employees supplied by another employer to perform labor within the employer’s usual course of business. . (c) Injunctions against unfair labor practices involving discharge or other serious economic loss Section 10(j) of the National Labor Relations Act ( 29 U.S.C. 160(j) ) is amended— (1) by striking (j) The Board and inserting the following: (j) (1) The Board