I found other information in the manifest see link
http://interactive.ancestry.com/7488/NYT715_1501-0842/403364... ----- Page 718 of 1290, Questions 1- 12 see Page-719 for Questions 13 - 29.
Next to line 14/15 you will see their names and to the left - Admitted -
In Col - 3 their ages 15 and 14
Col -11 Mother: Mar or Mari Johanson
Col - 18 Father: J.A. Olson Address: 2100 or 2000 D Ave. Ensley, Ala.
From your original link under column " Cause of Detention" LPC means "Likely Public Charge" it would probably mean a person who may have to receive Public Support or Welfare because they cannot find a job or may not want to work at all. Sturek and Frank were both under 18 which may have been a reason why they were detained also their mother has a different surname then their father's.
Also note on line 16 is a Karl J. Johanson Age: 19 who is also going to 2100 or 2000 D Ave. Ensley, Ala. to see his brother S.J. Olson.
Tim