No employer, in paying his employees the salary or wages due them, shall inclose their pay in “pay envelopes” upon which there is written or printed the name of any candidate or any political motto, device or argument containing threats, express or implied, intended or calculated to influence the political opinions or actions of such employees. Nor shall an employer, within ninety days of an election, put up or otherwise exhibit in his factory, workshop, or other establishment or place where his workmen or employees may be working, any handbill or placard containing any threat, notice or information that in case any particular ticket of a political party, or organization, or candidate shall be elected, work in his establishment will cease, in whole or in part, or his establishment be closed up, or the salaries or wages of his employees be reduced, or other threat, express or implied, intended or calculated to influence the political opinions or actions of his employees.