A hierarchical force-directed graph displays clustered communities as large nodes, with links connecting them at the top level. Clicking a community navigates to a subgraph of its member nodes, rendered via `d3.forceSimulation`, `forceLink`, and `forceManyBody`. The SVG visualization uses `scaleOrdinal` for node positioning and zoom/pan via `d3.zoom`. Data is parsed from a fetched text file using `parseGraphDataset`, with node and link stroke properties scaled by link weight.