Full Disclosure in Lobbying Act - Amends the Lobbying Disclosure Act of 1995 to require a registered lobbyist's semiannual disclosure report, in the case of a registrant (subcontractor) retained by another person or entity to engage in lobbying activities on behalf of a third person or entity, to include: (1) the name, address, and principal place of business of the other person or entity that retained the subcontractor; (2) the name, address, and principal place of business of the third person or entity on whose behalf the lobbying activities were performed; and (3) the amount of funds paid, during such reporting period, to the subcontractor as well as to the other person or entity who retained the subcontractor for such lobbying activities.