They want women to enter the temple.
The Bhumata Brigade founder said she was happy to hear that two women in their forties had managed to reach the "sannidhanam" (temple complex) and offer prayers to Lord Ayyappa and congratulated their effort.
The women's entry into the temple is certain to provoke a new gender storm. Media reports said some were heckled and stoned by right-wing activists.
BBC Hindi reports that five million women from all over Kerala lined up along highways to form a chain "which stretched from the northern tip of Kasaragod to the southern end in Thiruvanthapuram".
The Supreme Court decision to let women worship at the Sabarimala shrine came after a petition argued that the custom banning them violated gender equality.
The women, who are now under police protection, can be seen leaving the shrine in videos that have been circulating on WhatsApp.
Religiously fueled protests escalated in the Indian state of Kerala on Wednesday, with police charging Hindu worshipers with batons and using tear gas, water cannon and stun grenades to disperse rioters in the state capital of Thiruvananthapuram.
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Social activist Trupti Desai Wednesday hailed the entry of two women in their mid forties into the Lord Aayyappa hill shrine in Kerala's Sabarimala, saying it is a "victory of equality".
Cloaked in black veils and shrouded in early morning darkness, two women of menstruating age group made history on Wednesday when they stepped into the Sabarimala temple of Lord Ayyappa, breaking a centuries-old tradition defying dire threats from the Hindu right.
The temple was opened on December 30 for the Makaravillaku festival and there has been a heavy rush of pilgrims.
The decision sparked massive protests, with crowds physically stopping women from accessing the temple. Traditionally, girls and women in the menstruating age group of 10-50 years are barred at the shrine.
The event dominated the conversation on social media, where users kept sharing powerful images of women standing up for their rights.
The Sabarimala temple is devoted to the deity Lord Ayappa, who according to legend was born from a union between two male gods.
India's ruling Bharatiya Janata Party (BJP), which has pursued a Hindu nationalist agenda, has painted the September court ruling as an attack on traditional Hindu values.
The Supreme Court is to start hearing a legal challenge to its ruling on 22 January.