Excessive or discriminatory fees (Section 8(b)(5))

It is unlawful for a union to require employees covered by a union-security agreement to pay excessive or discriminatory initiation fees.

Section 8(b)(5) of the Act makes it unlawful for a labor organization or its agents "to require of employees covered by [a union-security agreement] the payment . . . of a fee in an amount which the Board finds excessive or discriminatory under all the circumstances . . . ."