Libertarians being Pro-Union?

Now, you might be thinking that a Libertarians are against Unions, some libertarians are anti-unions but for me I'm for private individuals forming an organization that would help them negotiate deals with the employers this would describe a union.  Unions have and still should be in the forefront of our economy.  Unions did some good things like help increase the average wage of Americans.  They provided safer working conditions, help workers getting payed more and some other things.  What I do disagree about unions is their tendency to use government force for their benefit (this is also true for a lot of businesses like instead of going to a bank to get a loan they go to government).  Not all unions are equal because I do favor private sector unions but government unions should be disbanded.  Now about government unions are in the most technical since private but because they keep pressuring the politicians to increase their benefits (which in itself I don't have a problem), but the politicians tends to over due the benefits of public employees in the time of economic boom then when the economy goes under then the issues really come to arise.  The sad thing is that the politicians that are responsible are long gone, in this current situation (especially in California's cities) I would be against the idea of public sector unions.  Now, if the politicians were held to a really high standard then they wouldn't be put into these lucrative situations.  We live in a time where unions is a "dirty word" but I do have to give them the respect that I do for any other private organization.