Odd radical subgroups of some sporadic simple groups

The radical p-subgroups of the Monster, the Baby Monster and the Harada–Norton group HN for p=3,5,7 are determined up to conjugacy, which completes the classification problem of odd radical subgroups for all sporadic simple groups together with [M. Kitazume, S. Yoshiara, The radical subgroups of the Fischer simple groups, J. Algebra 255 (2002) 22–58] and the other works.