The United States District Court for the District of Columbia has held that precluding employers and employer associations from financing suits brought by employees against their unions violates the employer's or employer association's freedom of association and speech, and right to petition.
UAW v. National Right to Work Legal Defense and Education Foundation, 433 F. Supp. 474 (D.D.C. 1977).
David A. Ricchuito,
First Amendment - Labor Law - Labor-Management Reporting and Disclosure Act - Section 101(a)(4) - Employer-Funded Suits,
Duq. L. Rev.
Available at: https://dsc.duq.edu/dlr/vol16/iss3/10