"JMM has a long tradition of trading in politics. First, it traded to save the erstwhile P V Narasimha Rao government in the 1990s, and now it is indulging with BJP in Jharkhand," he said here.
Addressing a gathering at the Town Hall as part of the birth centenary celebration of party ideologue P Sundarayya, Yechury blamed JMM for the current political impasse in the state.
On Christmas day, JMM leader and Deputy Chief Minister Hemant Soren asked Chief Minister Arjun Munda to clear his stand on JMM's claim over a power sharing formula.
Munda had on Thursday sent a reply in writing what he and the BJP have been saying that there was no such understanding when the two allies formed government under his leadership on September 11, 2010.
JMM is in the ministry under BJP leadership and supports Congress at the Centre.