Chicago Newspaper Guild Executive Director Craig Rosenbaum says the charge will be filed in reaction to the Sun-Times Media company's announcement Thursday that it's laying off its entire full-time photography staff.

Rosenbaum says the union is negotiating a new contract and the company told the union at the bargaining table that no layoffs of photographers were planned.

Sun-Times Media released a statement Thursday to The Associated Press confirming "the very difficult decision" to do away with the positions at the city's tabloid newspaper and its suburban sister publications.