Taken from The Conservative Mind by Russell Kirk:
1) The perfectibility of man and the illimitable progress of society: meliorism. Radicals believe that education, positive legislation, and alteration of environment can produce men like gods; they deny that humanity has a natural proclivity toward violence and sin.
2) Contempt for tradition. Reason, impulse, and materialistic determinism are severally preferred as guides to social welfare, trustier than the wisdom of our ancestors. Formal religion is rejected and a variety of anti-Christian systems are offered as substitutes.
3) Political levelling. Order and privilege are condemned; total democracy, as direct as practicable, is the professed radical idea. Allied with this spirit, generally, is a dislike of old parliamentary arrangements and an eagerness for centralization and consolidation.
4)Economic levelling. The ancient rights of property, especially property in land, are suspect to almost all radicals; and collectivistic reformers hack at the institution of private property root and branch.