Colorado Revised Statutes Title 8. Labor and Industry § 8-1-126. Lockouts and strikes unlawful--when

(1) It is unlawful for any employee in the state personnel system or for any labor organization, through formal action or through its agents, to incite, encourage, aid, or participate in a strike, stoppage of work, slowdown, or interruption of operations by employees in the state personnel system.

(2) It is unlawful for any employer to declare or cause a lockout, or for any employee to go on strike, on account of any dispute prior to or during an investigation, hearing, or arbitration of such dispute by the director, or the board, under the provisions of this article. Nothing in this article shall prohibit the suspension or discontinuance of any industry or of the working of any persons therein for any cause not constituting a lockout or strike, or to prohibit the suspension or discontinuance of any industry or of the working of any person therein, which industry is not affected with a public interest. Nothing in this article shall be held to restrain any employer from declaring a lockout, or any employee, except an employee who is in the state personnel system, from going on strike in respect to any dispute after the same has been duly investigated, heard, or arbitrated, under the provisions of this article.