(a) Whoever, being an agent, operator or employee of any telegraph, cable, telephone or radio office, willfully—
(1) refuses or neglects to send any message received at such office for transmission; or
(2) postpones the same out of its order; or
(3) refuses or neglects to deliver any message received by telegraph, cable or telephone—
shall be fined not more than $500 or imprisoned not more than 1 year, or both.(b) Subsection (a) of this section shall not be construed to require any message to be received, transmitted or delivered unless the charges thereon have been paid or tendered, nor to require the sending, receiving or delivery of any message, counseling, aiding, abetting, or encouraging treason, or other resistance to the lawful authority, or any message calculated to further any fraudulent plan or purpose, or to instigate or encourage the perpetration of any unlawful act, or to facilitate the escape of any criminal or person accused of crime.