A San Francisco technology company laid off a group of software engineers as they were trying to join a labor union, according to a complaint filed with the National Labor Relations Board. The Communications Workers of America claims Lanetix, which makes cloud-based software for transportation and logistics companies, violated federal labor laws by cutting 14 software engineers in January in San Francisco and Arlington, Va. Most of the engineers were fired Friday, about 10 days after they filed a petition seeking union representation, according to the complaint filed by the CWA's Washington-Baltimore Newspaper Guild. A hearing to determine a date to hold the union vote was scheduled for Thursday.