In an effort to block the city’s newly signed wage equity law, the Chamber of Commerce for Greater Philadelphia plans to file a lawsuit, stating that the law “violates businesses’ freedom of speech.” The law, which will take effect May 23, bans employers from asking applicants for salary history in an effort to close the wage gap between men and women. The city’s mayor believes the law will withstand a challenge. The Chamber’s executive committee, which includes more than two dozen members, voted unanimously to file the suit.