Lyndon Johnson actually said...

"The Captain of the Port may prevent any person, article, or thing from boarding or being taken or placed on board any vessel or entering or being taken into or upon or placed in or upon any waterfront..."

"Captain of the Port...means the officer of the Coast Guard, under the command of a District Commander, so designated by the Commandant for the purpose of giving immediate direction to Coast Guard law ..."

"Security zone...means all areas of land, water, or land and water, which are so designated by the Captain of the Port for such time as he deems necessary to prevent damage or injury to any vessel or w..."

"Waterfront facility...means all piers, wharves, docks, and similar structures to which vessels may be secured; areas of land, water, or land and water under and in immediate proximity to them; buildin..."