Background This study investigates the influence of perceived follower–leader congruence in basic moral behaviors, as defined by the morality-as-cooperation theory (MAC), on the perceived level of ethical leadership. Although important for the leadership theory and practice, this association is scarcely covered by the literature. Methods The study employed a mixed-methods approach, consisting of a one-site quantitative survey in Phase 1 carried out in a Russophone logistics company, and a follow-up series of semi-structured interviews within the same population in Phase 2. Results The results of Phase 1 showed a moderate positive correlation (r(54) = [.34;.64], p < .05) between perceived congruence in each MAC element and the perceived level of ethical leadership, whereas the findings from Phase 2 demonstrated that this association is causal. Moreover, the research unexpectedly revealed that the influence of the congruence in care for kin, heroism, and deference is mediated by the congruence in loyalty to the group and reciprocity, with the significance level at p < .05 for all indirect effects. The study also found a moderating role of duration of leader’s moral behavior observation by followers. Conclusions This research advances ethical leadership literature by applying the MAC theory to studying the antecedents of the perceived leaders’ ethicality and revealing the mediating role of some basic moral values in assessing a leader’s ethicality. Besides, the study contributes to the cross-cultural validity of both MAC and ethical leadership theories by testing the respective instruments in a Russophone organization.
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