SGPC chief Avtar Singh Makkar told reporters here that the Congress had challenged the supremacy of Akal Takht, the highest temporal seat of Sikhs, which had highest regards among the community.
He also urged the Sikhs to teach Congress a lesson in the October 15 polls.
SGPC along with Shiromani Akali Dal (SAD) were at loggerheads with Bhupinder Singh Hooda government in Haryana after it created a separate body to manage affairs of Sikh shrines in the state.