The executive board is elected by the members of the local union, or appointed by the elected members. The job of the Executive Board is to support Union Members by following the language of the contract.
Union officers have a fiduciary responsibility to their members.
Fiduciary: From the on-line Legal Dictionary: one often in a position of authority who obligates himself or herself to act on behalf of another (as in managing money or property) and assumes a duty to act in good faith and with care, candor, and loyalty in fulfilling the obligation : one (as an agent) having a fiduciary duty to another
When a fiduciary duty is imposed, equity requires a stricter standard of behavior than the comparable tortious duty of care at common law. It is said the fiduciary has a duty not to be in a situation where personal interests and fiduciary duty conflict, a duty not to be in a situation where his fiduciary duty conflicts with another fiduciary duty, and a duty not to profit from his fiduciary position without express knowledge and consent. A fiduciary cannot have a conflict of interest. It has been said that fiduciaries must conduct themselves "at a level higher than that trodden by the crowd" and that "[t]he distinguishing or overriding duty of a fiduciary is the obligation of undivided loyalty."