  We present the first X-ray observations of three sources belonging to a new
AGN class: the naked AGNs. Based on optical spectroscopic studies, these
sources appear as classical type 2 (obscured) AGNs, with only narrow emission
lines. However, long-term optical monitoring campaigns, carried out over more
than two decades, show that the same sources are strongly variable, like type 1
(un-obscured) AGNs. Based on short Chandra observations, the sources appear to
be fairly bright in the X-rays, with typical Seyfert 1s values for the photon
index (Gamma~1.8) and without significant intrinsic absorption, supporting the
conclusion that some bright AGNs may genuinely lack a broad line region.
Future, broad-band studies as well as deeper X-ray observations, probing both
the spectral and the temporal properties of the naked AGNs, are crucial to shed
light on the central engine of these sources, which may be representative of a
large class of AGNs.
