For further details of what happened to some of the arrested Kronstadters after the rebellion had been suppressed, I can recommend my translation of Fedor Dan's Two Years of Wandering (Lawrence & Wishart, 2016). Dan was in prison with some of the participants, and in his memoir he recounted the details they had told him, and some of their fates. The book also has some translations of RSDRP appeals from the time of the Kronstadt rebellion in an appendix. It's still in print. Go on, Steven - treat yourself to a copy! It's only £15.