(LEAD) Saenuri's 8-term lawmaker accuses interim head of carrying out purge
(ATTN: ADDS details on leadership panel meeting in last 4 paras)
SEOUL, Jan. 9 (Yonhap) -- Rep. Suh Chung-won of the ruling Saenuri Party on Monday sued its interim head for allegedly forcing loyalists of President Park Geun-hye to leave the party, ad