The controversial bill will make it illegal for companies to require workers to join unions.
Republican lawmakers continue to push for Indiana to become the 23rd right to work state, despite strong opposition from Democrats.
Local union workers along with a panel including Evansville Mayor Jonathan Weinzapfel blasted the proposal.
A packed house, some wearing their alliance to unions proudly, came to hear how a proposed right to work bill could affect Hoosier workers.
"As Martin Luther King said it has nothing to do with work and nothing to do with rights, the only reason that right to work is there is to destroy the unions," said IBEW Secretary Paul Green.
A panel including Mayor Weinzapfel-- IBEW Secretary Paul Green, UE history professor Dan Byne and the Catholic Charities' Gayle Ubelhor came together to discuss the potential pitfalls of a right to work bill.
As The Indiana Chamber Of Commerce released its report in support of right to work, about 200 people showed up to find out how they can fight back.
This group hopes by signing petitions- and showing up in numbers they can help block the bill.
The State's Chamber Of Commerce president says a right to work law will create jobs and boost income. The legislation has long been a priority of Republican lawmakers in the state.