Elizabeth McAlister (born November 17, 1939[1]) is an American peace activist and former nun of the Religious of the Sacred Heart of Mary.

During her sophomore year at Marymount College, McAlister, still Maureen, entered the novitiate of the Religious of the Sacred Heart of Mary (RSHM).

[2] While an instructor at Marymount College, McAlister got involved with peace demonstrations and prayer vigils against the Vietnam War.

These letters, which seemed to include plans to kidnap Henry Kissinger (the material was deliberately taken out of context), led to the prosecution of McAlister, Berrigan, and five others, known as the Harrisburg Seven.

[8] Berrigan had spoken and written about the importance of celibacy to activists, but abandoned his previous position against romantic entanglements for McAlister.

October 24, 2019, McAlister was convicted on four counts in federal court in Brunswick, GA for entering and holding a symbolic disarming[dubious – discuss] of the Trident submarine's nuclear weapons.

[17] Other defendants were Clare Grady, Martha Hennessey (Founder of the Catholic Worker, Dorothy Day's granddaughter), Carmen Trotta, Patrick O'Neill, Fr.