How to influence our legislators in Congress

There are many websites that deal with Catholic social justice issues. Many of these websites allow us to sign up to receive Action Alert emails. These alerts are set up so that we can contact our congressional legislators online through these websites. Here are some websites that allow for these signups:
NETWORK a National Catholic Social Justice Lobby started by nuns some 30 or so years ago - http://www.networklobby.org/ (On the right of the screen there is a signup format)
CENTER OF CONCERN Promoting Global Justice and Peace since 1971 started by the United States Bishop Conference and the Jesuits - http://www.coc.org/index.fpl/1809.html?cms_category=7 (the signup format is on the right side of the screen)
CATHOLIC RELIEF SERVICES an arm of the U.S. Catholic Bishops Conference http://actioncenter.crs.org/site/PageServer?pagename=ac_signup