The Town Planning Research Group (TRG) was a small informal "ginger group" which met monthly from 1967 to 1980. Its newsletters ("Irregular" and "Ecoso Exchange") are a useful resource on the grass roots community planning movements of the 1970's. Henry Mayer described the TRG newsletter as a "valiant effort" stating: "Ecoso has a lot of hard to get information relevant to the sustainable society/ecology movement and tries to foster links between it, the trade unions and some current left movements. Maurie Crow (1915 to 1988) was a key person in the TRG. He turned his attention to planning issues after about thirty years involvement in the trade union movement.