What is Crew?

Legal Definition
A crew is a body or a class of people who work at a common activity, generally in a structured or hierarchical organization. A location in which a crew works is called a crewyard or a workyard. The word has nautical resonances: the tasks involved in operating a ship, particularly a sailing ship, providing numerous specialities within a ship's crew, often organised with a chain of command. Traditional nautical usage strongly distinguishes officers from crew, though the two groups combined form the ship's company. Members of a crew are often referred to by the title Crewman.

Crew also refers to the sport of rowing, where teams row competitively in racing shells.
-- Wikipedia
Legal Definition
Those persons who are employed in the navigation of a vessel.

2. A vessel to be seaworthy must have a sufficient crew. 1 Caines, R. 32; 1 John. R. 184.

3. In general, the master or captain (q.v.) has the selection of the crew. Vide Muster roll; Seaman; Ship; Shipping articles.
-- Bouviers Law Dictionary
Legal Definition
The aggregate of seamen who man a ship or vessel, including the master and officers; or it may mean the ship's company, exclusive of the master or exclusive of the master and all other officers. See U. S. v. Winn, 3 Sumh. 209, 28 Fed. Cas. 733; Millaudon v. Martin, 6 Rob. (La.) 540; U. S. v. Huff (C. C.) 13 Fed. 630. See Crew list.
-- Black's Law Dictionary
Legal Definition
A ship’s company. See 3 Sumn. (U. S.) 209, Fed. Cas. No. 16,740.
-- Ballentine's Law Dictionary