It is alleged that the janitors are being asked to accept a wage freeze, reduced benefits and a reduced starting wage, the story noted.
An ABM Janitorial Services spokesperson said: "In the current negotiations, ABM Janitorial Services has put forward a very strong proposal to include these workers in the same agreement that the other SEIU Local 1877 janitors overwhelmingly approved just last year. That agreement provided workers substantially higher wages, improved access to family health care and other benefits through mid-2012. Under the proposal, the workers would now also qualify to receive wages, health care and other benefits consistent with those provided to the thousands of other local union-represented janitors."
The recent protests stem from disputes of a contract that ended October 31, the story added.