Question: who votes for the pro football hall of fame

title: Pro Football Hall of Fame
text: In April 1970 , ground was broken for the first of many expansions . This first expansion cost $ 620,000 , and was completed in May 1971 . The size was increased to 34,000 square feet ( 3,200 m ) by adding another room . The pro shop opened with this expansion . This was also an important milestone for the Pro Football Hall of Fame , as yearly attendance passed the 200,000 mark for the first time . This was at least in some part due to the increase in popularity of professional football caused by the advent of the American Football League and its success in the final two AFL - NFL World Championship games . Inside