"4437" does not make it illegal to "help someone illegal". Section 205 of H.R. 4437 amends Section 277 of the Immigration and Nationality Act (INA).
The INA already codified the crime and spelled out a penalty. H.R. 4437 amended the language of INA section 277, and changed the penalty a little.
Also, the crime is described as knowingly assisting an inadmissible alien to enter the USA. This is a very specific crime, and it is foolish to misrepresent the crime and/or the bill by making statements to the effect that 4437 makes it a felony to help an illegal immigrant. It is foolish because it is this sort of shrill overstatement that is used to foster opposition to newer/better border protection policies. The MSM promotes this sort of misinformation and apparently loves to mislead the public.
The Spanish-language media also do their best to inflame things. Targeting the yutes of America can lead to unsavory results. Teenagers are already natural drama queens/hysterics without having outside agitation thrown into the mix.
Didn't find what you are refering to, as Sec 277 addresses crossing the border - Hard to say these kids assisted in that when many were not even born yet ...
BUT, I did find in 4437 this section - 274 (1) (c) -
"`(C) assists, encourages, directs, or induces a person to reside in or remain in the United States, or to attempt to reside in or remain in the United States, knowing or in reckless disregard of the fact that such person is an alien who lacks lawful authority to reside in or remain in the United States;
Which appears to create the crime that these kids are rightly afraid of.