A bunch of full of them selves corps members who ruin public schools. They think they are gracing the public school system just by showing up. They are usually really bad at what they do. Treat teaching like a popularity contest, act inappropirately with students, and make up fancyfull data to support their self serving orginization.
TFA consistently lies about their data--that is common knowledge--if this data is coming from TFA . . . don't trust it! If you want to make your data show "value-added" gains, look to TFA to learn how to fudge.
Teacher A : "Why are all my students rude, distrespectful and have no skills?"
Teacher B: "Oh,, there was a Teach for America teacher in there before you."