How to successfully dismantle political garrisons

In Jamaica a political garrison is an area where at least 90% of the eligible votes are cast for either the PNP or JLP. Those votes are usually secured by way of coercion, intimidation (both implicit and explicit) or through bribery. Another distinct characteristic of political garrisons is the refusal of many residents to pay utility bills. There is minimal investment in the area by the established private sector and whatever infrastructure is still standing is decayed and there is usually an absence of civic pride.