 Complete the following phrase:  In the late 1960s, the CPA, under the leadership of National Secretary Laurie Aarons, became a strong supporter of Eurocommunism, of abandoning Leninism and democratic centralism, and trying to form a united front of the various left-wing forces thrown up by the movement of opposition to the Vietnam War. The CPA leadership had become increasingly critical of the Soviet Union, particularly over the 1968 Warsaw Pact 