Russell, up until a year before he died, was still preaching against sectarianism. As late as 1915 (just before his death in 1916) he was teaching the following:
The Lord in Heaven records as members of His true Church all the saintly - whether Roman Catholics, Anglican Catholics, Greek Catholics, Baptists, Methodists, or Presbyterians, etc. -- and none others.
Have we not here the one Church, catholic, universal, the only Church which the Bible recognizes? In the past we have been too narrow and have supposed that God was as narrow as ourselves. It was on this account that Presbyterians, Roman Catholics, Anglicans, Baptists, Methodists persecuted and were persecuted, each thinking itself the true Church. Are we not all getting broader conceptions of our God and of His Church? Do we not see that we were mistaken in calling the outward organization the Church of Christ instead of remembering that the Lord alone writes the names of the Church, that He alone reads the hearts, that He alone is the Judge, and that He alone has the right to blot out the names of reprobates?
St. Paul wrote against sectarianism, already manifest in his day-some saying :"I am of Paul"; others, "I am of Peter"; etc. The Apostle asks, "Is Christ divided:" (1 Corinthians 1:10-13)
The above was printed in Bible Students Monthly, Volume 7, Number 9 (1915), Under the title, "The Catholic Church -- St. Peter's Kingdom Keys." It was reproduced in the Chicago Bible Students publication: Harvest Gleanings Volume 1.
http://rlctr.blogspot.com/2008/09/xf01-catholic-church.html
We have the tens of thousands of pages that have been produced from the works of Russell that provide overwhelming testimony that Russell was not a Freemason. He plainly stated: “I have never been a Mason.”
http://ctr.reslight.net/?p=763
He did employ some terminology from the Freemasons and many others to provide illustrations of various things taught in the Bible. There is no doubt in my mind that Russell was not a member of the Freemason organization. Indeed, no one has presented any proof whatsoever that Russell lied when he said, "I have never been a Mason." What is often presented is what has been conjured up in the spirit of human imagination. Overwhelming evidence in his writings that he was not a Mason; zero evidence that he was Mason.
http://ctr.reslight.net/?cat=3
Most of Russell's works may be found online:
http://agsconsulting.com/htdbv5/start.htm