There is a local group of Basic Income supporters in New York City that has recently launched (with their first meeting on May 20, 2015) and is searching for new members. This group has created several channels through which supporters can get involved and is currently focusing on the prospect of a political movement for basic income in NYC.
See the new website here: basicincome.nyc
See their associated Facebook pages here: https://www.facebook.com/basicincomenyc and here: https://www.facebook.com/groups/361954070667293/