Response, Attach. 1 (OLC Memorandum).[4] The OLC Memorandum concludes that, under 18 U.S.C. ?? 1913: ???federal employees who are union representatives may [not] use their official time to engage in ???grass roots??? lobbying in which, on behalf of their unions, they ask members of the public to communicate with government officials in support of, or opposition to, legislation or other measures.??