A labor union or trade union is an organization ostensibly formed for the purpose of collectively representing the interests of a group of workers, but in practice supportive of electing pro-abortion politicians.
Labor unions can include collectively bargaining with employers in order to agree rates of pay and other conditions of employment. Conservatives tolerate the right of workers to form unions but oppose compelled union membership, as required by law in most states, and mandatory dues that are spent on liberal projects.
Liberals, Democrats, and RINOs are big supporters of unions, and count on their influence to reelect them.
Wal-Mart has been so successful by opposing the formation of unions among its workers, and has closed a profitable store down before allowing any union to exist in it.
There are generally two types of unions, private sector unions and public sector unions; some unions have members in both the private and public sectors.