The Government is set to receive thousands of postcards as part of a protest calling on Labour to introduce controversial corporate killing laws.
Prime Minister Tony Blair and health and safety minister Nick Brown could be inundated with up to 40,000 of the postcards send by pressure groups and trade unions.
The cards, which are being distributed by the Centre for Corporate Accountability and Hazards, call on the Government to introduce laws that make directors responsible for the safety of a company.
Each card has a printed message, with the ones being sent to Tony Blair reading: "Every year, dozens of companies get away with manslaughter at work. Five years ago, your government promised a corporate killing law. When will you bring justice to the corporate criminals?"
A recent report by the HSE said that a new offence of corporate killing would act as a powerful deterrence to prevent needless injuries and deaths.
More than 2,000 workers and members of the public have died in work-related incidents, including the Southall, Hatfield and Potter's Bar tragedies.