Below are some links to helpful organizations working on important advocacy and lobby efforts:

Center of Concern
The COC envisions a world in which every woman, man and child can survive, thrive, and give back to our communities, enhancing life for all who share the planet.  Through research, analysis, networking, public education and advocacy, the Center works to advance more just, sustainable and authentically human development for all, especially for the marginalized and those in poverty.

NETWORK
A National Catholic Social Justice Lobby, NETWORK educates, lobbies and organizes to influence the formation of federal legislation to promote economic and social justice.  Through faith-based educational resources and programs related to public policy, NETWORK Education Program (NEP) engages people in envisioning and working toward a just and equitable society.  NEP facilitates nonpartisan issues analysis, skills development for responsible citizenship, and faith reflection on political ministry.  NEP's vision of a just society is grounded in Gospel values, Catholic Social Teaching, concern for the integrity of creation and the life experiences of people who are poor or marginalized.

The Wilderness Society
The Wilderness Society has been protecting America's Wilderness since 1935 through the potent combination of science, advocacy and education, and its mission is to deliver to future generations an unspoiled legacy of wild places, with all the precious values they hold: Biological diversity; clean air and water; towering forests, rushing rivers, and sage-sweet, silent deserts.  The Wilderness Society brings to bear scientific expertise, analysis and bold advocacy at the highest levels to save, protect and restore America's wilderness areas.

Catholic Relief Services
CRS was founded in 1943 by the Catholic Bishops of the United States.  Its mission is to assist the poor and disadvantaged, leveraging the teachings of the Gospel of Jesus Christ to alleviate human suffering, promote development of all people and to foster charity and justice throughout the world.  Working through local offices and an extensive network of partners, CRS operates on five continents and in more than 90 countries.  CRS aids the poor by first providing direct assistance where needed, then encouraging them to help with their own development.  Together, this fosters secure, productive, just communities which enable people to realize their potential.  As the official international relief and development agency of the U.S. Catholic community, CRS is also committed to educating the people of the United States to fulfill their moral responsibilities toward our global brothers and sisters by helping the poor, working to remove the causes of poverty, and promoting social justice.

New York State Catholic Conference
The New York State Catholic Conference represents the Bishops of New York State in matters of public policy.  The role of the Conference is to seek justice, fairness and charity for all, with a particular emphasis on the poor and vulnerable.  The Conference is neither Democrat or Republican, liberal or conservative.  Its positions transcend political platforms or ideologies and are based on the principles of Catholic social teaching and recognition of the innate dignity of every human person made in the image and likeness of God.