The National Basketball Players Association is planning to file a lawsuit against the league on Tuesday for antitrust violations, according to a lawyer for the association.The players association this week said it would no longer continue in collective bargaining and will become a trade association in order to pursue legal action against the National Basketball Association, with the entire 2011-12 season hanging in the balance.The NBA has already canceled the first month of a regular season that was scheduled to begin two weeks ago.The players\' lawyer, David Boies, announced the impending lawsuit in a press conference on Tuesday.