Healthy Unions are an essential ingredient of broadly shared prosperity a.k.a. a Middle Class society. Unions are part of a larger network of elements which include progressive taxation, regulations, and middle class programs (all of which lead to solid jobs, stable financial markets, and an affordable cost of living).
Unions are one of the things that separates the 1st and 3rd world. In the 3rd world labor has no power. Workers are ruthlessly exploited in sweat shops. They cannot organize. For this reason, in the 3rd world all the wealth accumulates in the hands of a corrupt & wealthy elite who buy government for their own enrichment. Question: What separated America from the Soviets during the Cold War? Answer: America had a thriving middle class, whereas the average citizen in Russia was poor and powerless. American workers -- because of unions -- lived well and could send their children to college. That is to say, unions were part of what gave working class families upward mobility, the very thing that separated us from all those evil-doers the right is conditioned to hate.
[But there was a downside to the postwar world of unions and shared prosperity. The owners of capital had less wealth (and thus less money to fund elections and buy media, i.e., less concentrated power to shape laws and opinions). They could not retire young and leave their children with dynastic wealth. To the contrary, money was in the hands of more people who, in turn, pumped that money into the economy (which lead to incredible economic growth). Unions were one of the things that prevented the narrow concentration of wealth and political power. Unions gave average hard working Americans a seat at the table. Reaganomics moved unions out of Washington in favor of lobbyists]
The Reagan Revolution got rid of unions mostly in order to give the owners of capital cheap labor. They also pushed relentlessly for open borders so capital could flow instantaneously to the cheapest labor markets. That is, the anti-union movement went hand in glove with globalization, which itself was designed to give capital access to sweat shop labor in the 3rd world. The owners of capital shipped American jobs to terrible places -- places with dictators and terrorists -- because those places maintained an iron fist over their workers, paying them pennies a day to make Nikes. Conservative complaints about evil doers in the 3rd world are tragically ironic: the cheap oil and resources which capital requires comes from market arrangements made possible by the Reagan Revolution. Capital loves sweat shops because cheap labor means higher returns.
But most of all: capital hates unions because they hurt the bottom line.
The point of Reaganomics was to replace the GM job model (high wages and benefits) with a sea of no-benefit, low-wage temp jobs. This transition also required moving the middle class to debt-financed consumption. That is, under Reagan the middle class would increasingly be loaned the money they formerly made from union-guaranteed wages, benefits, and government programs. This formula (of keeping the middle class afloat with high interest loans) lead to unsustainable debt levels. It got so bad that Americans had to use their homes as ATMs just to maintain the very living standard that Reagan promised would trickle down. (Who knew that it would trickle down in the form of the credit industrial complex?)
Please note: the Right didn't reduce union membership overnight. They launched a 30 year propaganda war against them. They created an army of think tanks, political action committees, and popular media to shift American opinion against unions and government. They shifted populist anger from the corporate fat cat to the union boss. And it worked. The low information voter bought it hook-line-&-sinker. Now... today .... America is shifting to a 3rd world distribution scheme, where workers are paid less and less, and a small group of wealthy accumulate more and more, as they protect themselves inside hyper-secure gated neighborhoods.
The innocent conservative voter has been deceived. They voted for a movement which is bringing sweat shop poverty to the USA. This was the point of Reagan: to give cheap labor to capital. Welcome to it. You ain't seen nothing yet. In 2012 when the right re-takes the White House, they are going to need more terrorism than ever to distract the serfs from the final phase: Goodbye Social Security and Medicare. Welcome to the 3rd world people!