Hall was active on behalf of various
progressive movements. He was an admirer of
Pierre-Joseph Proudhon, French politician, philosopher and socialist, of
Benjamin R. Tucker, editor and publisher of the individualist anarchist periodical
Liberty, and
Leo Tolstoy, the Russian novelist, pacifist and Christian anarchist. He was opposed to
Marxism and agreed with classical liberal political theorist
Herbert Spencer, who called it "the coming slavery." Before 1908 he established the Vacant Lot Gardening Association in New York City, which grew to "about 200 members" who "conducted a number of experiments in and near New York during its existence." One of them included the use of 30 acres of land on Bronxdale Avenue, near
White Plains Road, "which the
Astor estate had allowed us to use and on which a number of families had been living." Afterward, the association used property on
Dyckman Street near Prescott Avenue, not for cultivation, but for the establishment of a
tent city. The difficulty in getting free land for "vacant lot gardening" led Hall to establish the Little Land League, whose idea was to buy property no more than 90 minutes from New York for a training school, "and the people who have proved capable there we shall put on their feet as farmers on a larger piece of land further away." In 1909 he made a trip to Europe to study vacant-lot gardening. In 1910 he deeded some of land to establish the egalitarian community of
Free Acres in
Berkeley Heights, New Jersey, under which the residents pay only a
single tax on land values to the community, which, in turn, pays a lump sum to the city. Improvements such as buildings were not to be taxed, but only the value of the land. On June 5, 1916, he was arrested along with
Ida Rauh on a misdemeanor charge of distributing pamphlets on
birth control at a public meeting in
Manhattan's
Union Square on May 20 of that year. He was a disciple of
Henry George and one of the leading exponents of the
single-tax theory. He was opposed to
Tammany Hall, the organization that dominated the political life of the city in the early 20th century. He founded the New York Tax Reform Association. ==Personal life and demise==