Let L be the class of all finite groups G such that every supersolvable subgroup of G is nilpotent. It is proved in the paper that L is composed of solvable groups and is the largest saturated Fitting formation such that the intersection of L and U is contained in N, where U is the class of all supersolvable groups and N is the class of all nilpotent groups. Some properties of L-groups are also exhibited.
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