[PeterisP]

The union can force an all-or-nothing decision, but some companies can and will easily choose "nothing" and keep only the overseas developers, not the local unionized ones.

[pleasantpeasant]

I think there would be too many programmers who would be proud to take the jobs of other programmers trying to unionize.

There are a lot of anti-unionists and Libertarian minded programmers in the US.

[linuxftw]

Libertarians aren't anti-union, they're anti-government enforced unions.

[sanp]

Unions are meaningless with collective bargaining enforced by the government.