One of the most important features of a post-industrial society is the relative weakness of labor unions. During the era of industrialization, most union members worked in manufacturing, so when manufacturing began to decline labor unions inevitably lost members and with it, the relatively important political and economic clout they'd previously enjoyed.
Many of the jobs that have replaced the old industries, such as part-time roles in the service sector, are especially resistant to union organization. Employee turnover in this sector is relatively high, making it more difficult for labor unions to gain a foothold in the workplace. Such a rapidly shifting workforce is inevitably much harder to organize than the old industrial plants with their secure, well-paid jobs.
The end result of all this is that labor unions are considerably weaker than they once were. This has allowed businesses and their supporters in state legislatures to sponsor a series of so-called "right to work" laws that have made it harder for labor unions to organize workers and insist on compulsory union membership as a condition of employment contracts.