No adequate sociological sampling of NF members took place, but interviews with members were carried out during the 1970s by Taylor, Fielding, and Billig. Max Hanna noted that as of 1973, most NF members were "from the skilled working class and lower-middle class" but that there was variation according to branch. Fielding observed that party activism was generally carried out by upper working and lower middle-class members rather than by their lower working-class and upper middle-class counterparts. Fielding also noted that the party contained individuals of all age ranges, although added that certain branches had a concentration of retirees and that men in their thirties and fifties predominated over those in their forties, suggesting that the latter were typically too preoccupied with raising families to involve themselves heavily in NF matters.