On Tuesday, a coalition of contractors, including a newly formed alliance of firms owned by women and minorities, announced the start of an advertising and lobbying blitz in Albany and New York City. But a counter-lobby of unions, workers’ advocates and trial lawyers is pushing back just as fiercely. The law, they argue, is essential to ensuring the safety of workers in some of the world’s most dangerous jobs, particularly those employed by shoddy contracting firms that cut corners to save money. The law, they say, holds developers and contractors accountable for keeping job sites safe.

Gov. Andrew M. Cuomo this week acknowledged the politically loaded atmosphere surrounding the Scaffold Law, but suggested that he was open to the possibility of modifying the law.

The law states that contractors and property owners are responsible for ensuring that scaffolds, hoists and other devices that enable aboveground building construction and repair “shall be constructed, placed and operated as to give proper protection to a person so employed.”

When injuries result from a violation of those terms, the law says, contractors and owners are liable. There is no mention of worker responsibility. Under the law, however, the plaintiff still must show that a violation of the law’s standards occurred and that the violation caused the injury.

But those seeking to change the law want to incorporate a standard of “comparative negligence.” This amendment — described in a state bill submitted earlier this year — would require a jury or arbiter to consider whether the liability of the defendants, and thus the amount of damages, should be reduced for cases in which the worker’s negligence or failure to follow safety procedures contributed to the accident.