Acting On Behalf Of The U.S. 
Government
Former employees can make representations back if they are carrying out official duties on behalf of the United States. For example, the post-employment restrictions do not apply to a former employee who is re-employed by the United States or is called as a witness by Congress.
The restrictions do apply, however, to former employees who work for a federal contractor. That work is not deemed to be “an activity on behalf of the United States.” Working for a contractor will NOT absolve you from your post-employment restrictions. See 5 C.F.R. 2641.301(a) and (b).
