Colorado Bill Introduced to Prohibit Public School Teacher Strikes

How is this in any way Constitutional? Bill sponsors: Senator Bob Gardner (R) (303-866-4880) & Representative Paul Lundeen (R) (303-866-2924).

1st Amendment: "Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the government for a redress of grievances."

Bill Summary
"The bill prohibits public school teachers and teacher organizations from directly or indirectly inducing, instigating, encouraging, authorizing, ratifying, or participating in a strike against any public school employer. Public school employers are prohibited from consenting to or condoning a strike and from paying a public school teacher for any day during which the public school teacher participates in a strike.

In the event of a strike or the imminent threat of a strike in violation of the bill, the public school employer is authorized to seek an injunction from the district court. Failure by a public school teacher or teacher organization to comply with the injunction constitutes contempt of court and may be punished with fines or up to 6 months in county jail, or both.

If a public school teacher is found in contempt of court for failure to comply with an injunction, the bill directs the public school employer to immediately terminate his or her employment, without a hearing. If a teacher organization is found in contempt, any collective bargaining agreement negotiated by the organization is rendered null and void."