I was just reading Trail of the Stanley Cup Vol 1 and Coleman printed a letter from Art Ross to the Montreal Herald in 1910 written in protest about the league instituting a $5000 cap on salaries per team, and it got me wondering if there were any other player led movements to gain more equity or better treatment from the owners before WWII? Or any other caps put in place in the non NHL leagues from the time period of if this is just a one off outlier?