What constitutes unfair employment practices?

While giving a 2-week notice is a courtesy on the employee's part, unfortunately an employer need not extend the courtesy the other way.  Absent something like a union or employment contract which provides for different treatment or if this action violates company policy, your employer's actions are legal.  However, if you feel that discrimination played some sort of role, you may have a claim.  But just the fact that otherwise were treated differently than you does not suffice. For an employment discrimination claim you must show that such action was due to some type of discrimination (i.e., for reasons due to your race, religion, age, disability, sex, national origin). Since you didn't provide any details to this effect, it's hard to say.  Additionally, if others were allowed to stay after they gave notice, you could argue that your not being allowed to stay on violated unwritten company policy. But in order to prove this you would have to show a pattern over a period time of allowing employees to finish out their 2 weeks after giving notice.  Merely allowing a few employees to remain fo rthe full 2 weeks would not suffice.  Again, you didn't give much by way of details.

If you feel that you may have a legitimate claim here, you need to contact your state's department of labor or an employment law attorney.