Unravel the intricacies of political party corruption with this detailed paper, which delves into the murky waters of corruption during election campaigns, within parliamentary activities, and in the control of public assets and institutions. Illustrated with succinct cases from diverse countries - industrialized, developing, and transitional - it identifies where opportunities for corruption arise. While acknowledging the significance of campaign finance regulations and anti-corruption laws, the paper emphasizes their integration into a wider strategy. This encompassing approach advocates for strengthening intra-party democracy, fostering party competition, enhancing transparency, and bolstering monitoring by the pillars of a just society: a vigilant press, an educated public, and a vibrant civil society.