Harpal Brar was a founding member of Communist Party of Great Britain Marxist-Leninist, known by its acronym: CPGB-ML. CPGB-ML was formed in 2004, after some of its members split from Socialist Labor Party, which itself was a party that split from the Labor Party (UK). The CPGB-ML opposes Trotskyism, social democracy, democratic socialism and all forms of revisionism. In 1995, Harpal Brar published a book titled Social Democracy: ‘The Enemy Within’.
CPGB-ML opposes opportunism in the working-class movement and works for the establishment of socialism in Britain. At the eighth congress of the CPGB-ML in September 2018, Brar announced that he would step down as chairman of the party, to be replaced by Ella Rule.
He has written a number of books and articles: