During the term of a collective agreement the same conduct by an employer may give rise to both unfair labor practice charges and an arbitrable grievance. When this happens, the aggrieved union can process its dispute through:

Either the NLRB or the contractual grievance and arbitration process, but not both.

or

Both the NLRB or the contractual grievance and arbitration process.

or

alawsuit brought in federal court pursuant to Section 301 of the Labor Management Relations Act.

or

A lawsuit brought in federal court pursuant to Section 4 of the Norris-LaGuardia Act.