Answer: There is a strong consensus among economists that unions are bad for the U.S. economy.
Explanation: A union is a group formed by employees of an establishment or workers of the government whose duty is to fight for improved working conditions of its members.
A union can sometimes make unrealistic demands to their employers and also unions tend to shut down economic activities of their sector of operation, if their demands are not met. These factors makes unions partly an economical disadvantage.