The book, Practise Marxism, Not Revisionism, is not written in a textbook style. It is a collection of articles written at different times against the non-Marxist-Leninist or anti-Marxist-Leninist Practice of Marxism. Most of the articles included here are related to tactics. The entire history of the international communist movement tells us that revisionism always enters from the backdoor. Immediate political tactics and forms of struggle are generally, the backdoors from where revisionism enters the Party. whether the practice of Marxism is genuine Marxist-Leninist or non-Marxist-Leninist/anti-Marxist-Leninist is reflected in the beginning of the immediate political tactics and forms of struggle. Nepali communist movement cannot be an exception to this. When we look at the history of Nepali communist movement, it shows that non-Marxist-Leninist/Anti-Marxist-Leninist practice of Marxism made its entrance with the immediate political tactics and forms of struggle. This is a worldwide phenomenon that the Party leadership cannot deform Marxist-Leninist principles in the beginning. If they attempt it before giving slow poison to party cadres, they would face strong opposition from the majority of the leaders and cadres in the Party. So, they always advance towards their ultimate goal., i.e., revisionism of Marxism to that extent acceptable to the imperialists, practising Marxism in its non-Marxist-Leninist/anti-Marxist-Leninist essence as immediate political tactics and forms of struggle. By doing this, they can spread poisonous weeds in the Party from top to bottom and they succeed in winning the support of the majority of the comrades for revision of Marxism