Gaitskell's political philosophy became known as Gaitskellism, and from the late 1950s brought him into increasing conflict with the trade unions over nationalisation. Besides repudiating the unquestioned commitment to public ownership of the means of production, now seen as merely one of numerous useful devices, he emphasised the goals of personal liberty, social welfare and above all social equality. Gaitskellism tended to downplay loyalty to the Labour movement as a central ethical goal, and argued that the new goals could be achieved if the government used appropriate fiscal and social policy measures within the context of a market-oriented mixed economy. Gaitskell's cadre of supporters included Anthony Crosland, Roy Jenkins, Douglas Jay, Patrick Gordon Walker and James Callaghan.