Labor groups, along with allies in the Colorado legislature, gathered outside the Governor's Mansion on Tuesday to press Gov. Jared Polis to sign a bill that would eliminate a key requirement before unions can negotiate over imposing fees on non-union members.

Meanwhile, business groups urged the governor to veto the legislation, saying it would "upend the balance" that a nearly century-old law had maintained, which they argued had allowed Colorado to prosper.

Both sides are pressing the governor to side with them, even as labor is working to put a measure on the ballot that would mandate employers to have "just cause" for firing someone. If successful, the proposal would make Colorado only the second state in the country with such a rule.

The initiative, assuming it makes it to the bal

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