Discuss the legality of each of the situations below. Indicate and discuss fully the applicable legal basis for your conclusions. Do not discuss any state or local law in analysis.

An advertisement in a local newspaper which states "College gent looking for roommate. No blacks or Jews need apply

A dentist in the Bayou who puts a sign outside of his office that states "NO MUSLIMS" and who refuses to accept Muslims as patients

Pete's Barber Shop in Dothan, Alabama that only cuts "white heads" . "Sam's store", a department store with over a thousand branches across the United States that a) records the race of African-Americans on checks presented for payment and asks them for extra identification (but not do do for white customers); b) searches only black patrons as they exit the store; and c) refuses to admit "suspicious-looking black males under the age of 25? Explain, citing relevant law and/or cases.