On 5 September 1882 Shaw attended a meeting at the Memorial Hall, Farringdon, addressed by the political economist Henry George.[41] Shaw then read George's book Progress and Poverty, which awakened his interest in economics.[42] He began attending meetings of the Social Democratic Federation (SDF), where he discovered the writings of Karl Marx, and thereafter spent much of 1883 reading Das Kapital. He was not impressed by the SDF's founder, H. M. Hyndman, whom he found autocratic, ill-tempered and lacking leadership qualities. Shaw doubted the ability of the SDF to harness the working classes into an effective radical movement and did not join it—he preferred, he said, to work with his intellectual equals.[43]