Some unions requires all employees to become members and charge a fee.
Some unions abuse their power to negotiate with the employer to make union leaders wealthy instead of granting benefits to the employees.
Some unions work alongside gangs to rake in illegal profit.
Some unions force all employees to take the same position of the union on certain issues meaning that people who oppose the measure may be blacklisted and pretty much terminated if the union uses its muscle.
Again these are just some unions and YMMV, the history of unions has many pros and cons with some being notorious and others being very much necessary in this day and age.
Some unions abuse their power to negotiate with the employer to make union leaders wealthy instead of granting benefits to the employees.
Some unions work alongside gangs to rake in illegal profit.
Some unions force all employees to take the same position of the union on certain issues meaning that people who oppose the measure may be blacklisted and pretty much terminated if the union uses its muscle.
Again these are just some unions and YMMV, the history of unions has many pros and cons with some being notorious and others being very much necessary in this day and age.