Apple is known for being secretive and picky about who works on its popular devices, but now, union officials say, that thinking also applies to the construction workers. Several construction workers who were hired to build the exterior of Apple’s new campus were ordered to leave the site due to prior felony convictions. The ban is unusual for construction work, a field in which employers typically do not perform criminal background checks. “Apple is always nervous about preserving its proprietary information, and yet I don’t know how this would affect that concern,” said Michael Theriault, president of Iron Workers Local Union 377. Banning felons could bring about legal ramifications for Apple, said law professor, Lisa Klerman.