Can state street bank exchange all of GM employees out of the common fund and then tell them AFTER the excahnge already took place.

Her is the situation....all of GM emlpoyees can contribute as a part of their 401k money in a GM stock fund.........back in sept of 2008 GM benefits releases a memo. saying that employees can NO longer contribute in the GM stock fund because it was FULL, then in april of 2009 they released a memo. stating that state street bank acted as our fiduciary... and exchanged us out of it....! when i first learned of this I called gm benefits they didn't even know it had happened because i learned about it from reading the paper online.... the question here is this... they didn't act in the best interest of the employees if they knew that GM was not viable which I'M SURE THEY DID..... why did they wait until it was 1.87 a share to exchange us out of..... and the upsetting part is this first of all they lock us in that fund is sept. then they exchanges us out of it and then notified us AFTER THE FACT....they are the fund managers they should BUT we have the right to know what they are about to do with the money before any transaction takes place....give us the choice do not take that choice from us....! normally fund managers look out in the best interest of the people , i feel that they didn't in this situation.... what do you think about all this.....? Thank you for reading this and getting back with me.