[en] This paper reviews recent high-field (up to 80 kOe) magnetization, nuclear-gamma-ray resonance, and neutron diffraction measurements on a number of actinide ferromagnets with the C-15 Laves phase crystal structure. NpAl₂ and NpOs₂ are an interesting contrast; NpAl₂ behaves as a localized 5f system whereas NpOs₂ exhibits properties usually associated with itinerant ferromagnets. The second part of the paper reports similar measurements on the series AnFe₂, where An = U, Np, Pu, and Am. The properties of these compounds suggest an increasing localization of 5f electrons as one proceeds from uranium to americium. The Pu ion in PuFe₂ is definitely trivalent 5f⁵, but the observation of a small negative moment on the Am site in AmFe₂ implies a partial occupancy of the Am²⁺ 5f⁷ state in this compound. This is the first indication of a mixed valence configuration in an actinide system