AFNIC, in common with a lot of registry operators, maintains a list of members / registrars on its website. It’s probably the most complete list you can find.
On Friday evening French registrar and hosting provider OVH decided to abuse the database and sent spam to a large number of the AFNIC members. The email, which used scaremongering language, was to push OVH’s services on smaller AFNIC member companies.
According to AFNIC’s own website’s terms and conditions this abuse of the data is forbidden, as you would expect. Now the question remains whether AFNIC will take any punitive action against OVH for the abuse.