(S (S (BASENP (DT This)) (VP (VP (VBZ is) (RB not)) (NP (BASENP (DT the) (JJ first) (NN time)) (SBAR (S (BASENP (NNS employees)) (VP (VBP have) (VP (VBN sued) (S (VP (VBG claiming) (SBAR (S (NP (BASENP (JJ mandatory) (NN attendance)) (PP (IN at) (BASENP (QT (DQL ``) (NNP Forum) (DQR '')) (NNS workshops)))) (VP (VBD violated) (BASENP (PRPD their) (JJ civil) (NN rights)))))))))))))) (PERIOD .))