How a major labor union won member support for a high-stakes contract campaign

The challenge

In the months before a major contract renewal deadline, a large labor union representing over 100,000 service workers faced a critical communications challenge. Leadership had secured a strong package at the bargaining table, meaningful wage increases, improved healthcare provisions, and new workplace protections. But in preliminary conversations with organizers, member sentiment was lukewarm. Without visible member enthusiasm, management had leverage to drag out ratification or reopen negotiations.

The union's communications team had three candidate frames they believed could build support: one focused on wages and economic benefits, one centered on worker dignity and respect, and one emphasizing worker voice and collective control. Each had intuitive appeal. What they lacked was evidence about which would actually move members, particularly across a membership that spanned three generations with meaningfully different priorities.

They needed an answer fast. Ratification communications needed to go out within 96 hours.

The approach

Grow Progress designed a randomized controlled trial fielded to 1,100 union members across the organization's geographic footprint. Respondents were randomly assigned to one of three message conditions or a control group that received no persuasion message. All participants answered the same outcome question before and after their assigned message exposure, measuring shift in support for ratifying the contract.

The three frames tested were:

• Frame A, Dignity & respect: Centered the contract as recognition of what members deserve, respect on the job, fair treatment, and the dignity every worker is owed.
• Frame B, Wages & benefits: Led with the economic gains, specific dollar amounts, healthcare cost savings, and improved retirement provisions.
• Frame C, Worker control (control): Emphasized collective power and the union's role in giving workers a seat at the table, the baseline frame the union had used in prior campaigns.

The study was fielded online and returned results within 24 hours of launch.

Results

The findings were unambiguous. Dignity framing produced the largest lift by a substantial margin, and the gap held across every subgroup tested.

What the data showed

The dignity frame's dominance was not driven by any single demographic segment, it won across the board. The subgroup analysis by age cohort is particularly telling: even among younger members who conventional wisdom might predict would respond more strongly to economic framing, dignity language outperformed wages messaging by double digits.

The consistency of the margin, 12 to 14 points across cohorts, suggests the finding is not an artifact of demographic composition. Dignity framing taps something durable across this membership, regardless of age or career stage. All results were statistically significant at p<.05.

How they used it

Armed with the findings within 24 hours of fielding, the union's communications team rebuilt their ratification messaging from the ground up. Every member-facing email, text blast, and town hall talking point was reoriented around dignity and respect, with economic details present but secondary.

Organizers were given one-pagers that explained the frame rationale in plain language, so they could adapt the messaging in conversations with hesitant members without losing the core theme. The communications director also used the subgroup data to give regional leads confidence that the frame would hold in their specific membership populations.

The contract ratified with broad member support. Internal tracking showed a notable increase in positive member sentiment in the two weeks following the communications push, an outcome the union attributed in part to using language their members actually responded to, rather than language that felt right to leadership.

"We thought we knew what our members cared about. The data showed us something more specific, and more actionable. Running with the dignity frame instead of our default messaging made the difference between a squeaky ratification and a real mandate."

, Communications Director, A Major Labor Union