Liberty State Delivery
Liberty State Delivery (LSD) is a delivery, and possibly postal, company presumably servicing Liberty City and Liberty State in Grand Theft Auto IV and Grand Theft Auto: Chinatown Wars.
The organization has no prominence in GTA IV, with next to no role in any of the games' storylines. However, it is prevalently based in a large public building (resembling the James Farley Post Office) in Middle Park East, Algonquin, while certain Yankee trucks feature the LSD corporate logo.
Trivia
Like Los Santos Delivery and the Liberty Sanitation Department, the Liberty State Delivery's abbreviation references lysergic acid diethylamide, a hallucinogenic drug commonly known as LSD.