Any judge, inspector or clerk of election or machine inspector who shall be guilty of any wilful fraud in the conduct of his duties at a primary or election, and any person who shall make a false return of the votes cast at any primary or election, or who shall deposit fraudulent ballots in the ballot box or certify as correct a return of ballots in the ballot box which he knows to be fraudulent, or who shall register fraudulent votes upon any voting machine or certify as correct a return of votes cast upon any voting machine which he knows to be fraudulently registered thereon, or who shall make any false entries in the district register, or who shall fail to insert in the voting check list the voter's certificate of any elector actually voting at any primary or election, or who shall fail to record voting information as required herein, or who shall fail to insert in the numbered lists of voters the name of any person actually voting, or who shall wilfully destroy or alter any ballot, voter's certificate, or registration card contained in any district register, or who shall wilfully tamper with any voting machine, or who shall prepare or insert in the voting check list any false voter's certificates not prepared by or for an elector actually voting at such primary or election, for the purpose of concealing the destruction or removal of any voter's certificate, or for the purpose of concealing the deposit of fraudulent ballots in the ballot box, or the registering of fraudulent votes upon any voting machine or of aiding in the perpetration of any such fraud, or who shall fail to return to the county board of election following any primary or election any keys of a voting machine, ballot box, general or duplicate return sheet, tally paper, oaths of election officers, affidavits of electors and others, record of assisted voters, numbered list of voters, district register, voting check list, unused, spoiled and cancelled ballots, ballots deposited, written or affixed in or upon a voting machine, or any certificate, or any other paper or record required to be returned under the provisions of this act; or who shall conspire with others to commit any of the offenses herein mentioned, or in any manner to prevent a free and fair primary or election, shall be guilty of a felony of the third degree, and, upon conviction thereof, shall be sentenced to pay a fine not exceeding fifteen thousand ($15,000) dollars, or to undergo an imprisonment of not more than seven (7) years, or both, in the discretion of the court.