Local Spokes is a New York City-based coalition of nine different local organizations that does bike advocacy in the Lower East Side and Chinatown (you can see a list of the nine at the bottom of this page). They do a great job, working particularly hard to reach low income people, immigrants, young people, etc. Elizabeth Press has a great video providing an overview of the work they do:
To understand the transportation needs of the neighborhoods, Local Spokes conducted an extensive survey in 2010 and 2011 and held a series of workshops in Chinese, English, and Spanish.
Last summer Local Spokes synthesized everything the coalition had gathered from this process into a neighborhood action plan for bicycling [PDF]. The goal of the action plan is to ensure that residents of the Lower East Side and Chinatown will have a role guiding decisions about bike-related policies and initiatives for their streets, and to create a model for community-based bike plans in other neighborhoods. (source)The action plan has been published here (pdf).