American automaker Tesla Inc. seemed to have caught the National Relations Board’s (NLRB) attention as the US labor law enforcer files a complaint against the auto company for unfair labor practices.

The federal agency issued the complaint after verifying that the company has violated workers’ rights by prohibiting their employees from leafleting or even talking about their working situations and safety issues at Tesla’s flagship factory in Fremont, California.

The charge additionally claims that the workers in Fremont were questioned by the management over protected union activities.

The workers also said that they were obligated to sign a contract that was too broad which states that they would be terminated or prosecuted if they ever tried to disclose any information about their job or working conditions either publicly or through media.