 The upheaval reflected the increased politicisation of the 1960s youth movement and the rise of New Left ideology, in a contrast with the hippie ideology behind the 1967 Summer of Love.For these students and activists, the Maoist philosophy of cultural revolution, purging society of its non-progressive elements, provided a model for social change.By and large, the Beatles had avoided publicly expressing their political views in their music, with "Taxman" being their only overtly political track thus far.