Can anyone point me to any actual persecution or mass discrimination of Catholics in the US today?

[Generic Other]

187. Restrictive covenants

A restrictive covenant is a type of real covenant, a legal obligation imposed in a deed by the seller upon the buyer of real estate to do or not to do something. Such restrictions frequently "run with the land" and are enforceable on subsequent buyers of the property...Before 1948, these covenants were legally used for segregationist purposes.[5] A covenant promised that only members of a certain race could occupy the property.

The Fair Housing Act of 1968 made housing discrimination on the basis of race or color, including racially restrictive covenants, illegal. The Fair Housing Act also created the Office of Fair Housing and Equal Opportunity which is charged with administering and enforcing the act.

In a project conducted by the University of Washington's Civil Rights and Labor History Program in 2010, it was found that more than 400 properties in Seattle suburbs alone retained discriminatory language that had once excluded racial minorities. "These restrictions just sit there quietly, casting a shadow of segregation in neighborhoods to this day," said James Gregory, a history professor at The University of Washington.[7]

http://en.wikipedia.org/wiki/Restrictive_covenant