Union based orgs typically went under because competitor labor was offshored or just cheaper (e.g. new airlines hiring pilots for $16k/year).
When you're competing with a Mexican, a Bangladeshi or a slave in Thailand all working for a pittance it doesn't necessarily matter how hard you work. Unemployment or poverty wages are your two choices.
Police unions and prison worker unions are more effective because they tend to aid rather than threaten capital. Teachers unions by contrast are not, which is why most governors declare outright war on them.
When you're competing with a Mexican, a Bangladeshi or a slave in Thailand all working for a pittance it doesn't necessarily matter how hard you work. Unemployment or poverty wages are your two choices.
Police unions and prison worker unions are more effective because they tend to aid rather than threaten capital. Teachers unions by contrast are not, which is why most governors declare outright war on them.