Here is the guideline for the new United Way corporate design. The United Way logo was introduced on 20 May 2004. It was designed in 1973 by Saul Bass and modified in 2004 by David Weinberger at FutureBrand.

Excerpt:
Building our brand
Founded upon a unique heritage of voluntarism and community building, United Way has served generations of Americans from all walks of life, providing both fund-raising and organizational resources to local charitable agencies.
Today, United Way is the nation's leading community impact organization, investing in and activating the resources that make the greatest possible impact in communities across America. We bring communities together to focus on their most important needs—building partnerships, forging consensus and leveraging resources in order to make a sustainable change in conditions.
We have a significant opportunity to build upon our traditional strengths, as well as to signal our organization’s movement towards a more meaningful and powerful mission—measurable community impact. Now is the time to declare what we stand for, what we value and what we are determined to achieve. This is the foundation of our brand promise. We fulfill our brand promise to all of our stakeholders by serving our communities with diligence and integrity. (…)

Source:
> United Way - Brand Guidelines

Also look at the design-reviews:
> by Tony Spaeth
> by Hans Stol