1. Wittgenstein in J. Tully (ed.) Meaning and Context: Quentin Skinner and his Critics (Cambridge: Polity, 1988), p. v.
2. See A. Callinicos, ‘Toni Negri in Perspective’, in G. Balakrishnan (ed.) Debating Empire (London: Verso, 2003), pp. 121–143.
3. See Callinicos (2003) and Steve Wright, ‘A Party of Autonomy?’, in T.S. Murphy and A.-K. Mustapha (eds) The Philosophy of Antonio Negri: Volume 1, Resistance in Practice (London: Pluto, 2005), pp. 73–106.
4. On Italian Trotskyism, see R.J. Alexander, International Trotskyism, 1929–1988: A Documented Analysis of the Movement (Durham, NC: Duke University Press, 1991).
5. The post-Marxist Ernesto Laclau considers that Hardt and Negri do not suffi-ciently break with the essentialism of Marxist class politics. For Laclau, revolutionary identity is the product of strategic thinking, that is a form of politics which goes beyond the immediacy of what May terms ‘tactics’. See David McLellan, Marxism After Marx (Fourth Edition) (London: Palgrave, 2007);