A worker at an open shop who is able to enjoy the benefits negotiated by a union without being a member of the union.
Someone who obtains goods or services legally without paying.
One who obtains benefit from a public good without paying for it directly.
A nonreproductive social insect, such as ant, bee, termite, or wasp.
A person who performs labor for a living, especially manual labor.
A female ant, bee, termite or wasp.
A thread performing one instance of a particular task within a program.