After recent successes in Michigan and Indiana, supporters of "right-to-work" laws now are focusing their efforts on Missouri, Ohio and Oregon. But instead of relying on potentially reluctant governors to enact the measures, they are looking to place the issue before voters.
In Missouri, the Republican-led Legislature will consider whether to refer the measure to the 2014 ballot.
Two dozen states currently have "right-to-work" laws that prohibit union fees from being a condition of employment.
A Missouri House committee is taking up legislation that would bar union membership or dues as a condition of employment.
The House Workforce Development Committee scheduled a public hearing Wednesday on the bill, which supporters call "right to work."
Approval by the Legislature would put the proposed new law to a statewide vote this November. Supporters argue the legislation would allow Missouri to be more competitive in the job market. Opponents say it would weaken unions and hinder collective bargaining.