Please capitalize where necessary: it was for this reason that the party led an inexorable ideological fight, explaining to all [its] members and to the non-party masses the harm and the danger of the anti-leninist proposals of the trotskyite opposition and the rightist opportunists.
It was for this reason that the Party led an inexorable ideological fight, explaining to all [its] members and to the non-Party masses the harm and the danger of the anti-Leninist proposals of the Trotskyite opposition and the rightist opportunists.