The District of Columbia sued Amazon on Wednesday, alleging the company secretly stopped providing its fastest delivery service to residents of two predominantly Black neighborhoods while still charging millions of dollars for a membership that promises the benefit.

The complaint filed in District of Columbia Superior Court revolves around Amazon’s Prime membership, which costs consumers $139 per year or $14.99 per month for fast deliveries — including one-day, two-day and same-day shipments — along with other enhancements.

In mid-2022, the lawsuit alleges, the Seattle-based online retailer imposed what it called a delivery “exclusion” on two low-income ZIP codes in the district — 20019 and 20020 — and began relying exclusively on third-party delivery services such as UPS and the U.S. Postal Service, rather than its own delivery systems.