Housing discrimination doesn't always mean having a door slammed in your face or a bigoted remark directed your way. Unsuspecting renters or home buyers may be politely turned away from the housing of their choice, even though they are qualified.
In Maryland, three African men were evicted when their landlord terminated the leases of black tenants and replaced them with white tenants.
In California, a disabled white woman who uses a guide animal was refused a rental unit in an apartment with a "no-pets" policy.
In Ohio, a Hispanic woman was denied housing because of an unlawful "no kids" policy.
Each of these people did something.
You can, too.