A quarter-century ago I barnstormed around the United States encouraging Americans, particularly students, to press for divestment from South Africa. Today, regrettably, the time has come for similar action to force an end to Israel's long-standing occupation of Palestinian territory and refusal to extend equal rights to Palestinian citizens who suffer from some 35 discriminatory laws.

I have reached this conclusion slowly and painfully. I am aware that many of our Jewish brothers and sisters who were so instrumental in the fight against South African apartheid are not yet ready to reckon with the apartheid nature of Israel and its current government. And I am enormously concerned that raising this issue will cause heartache to some in the Jewish community with whom I have worked closely and successfully for decades. But I cannot ignore the Palestinian suffering I have witnessed, nor the voices of those courageous Jews troubled by Israel's discriminatory course.

Within the past few days, some 1,200 American rabbis signed a letter — timed to coincide with resolutions considered by the United Methodist Church and the Presbyterian Church (USA) — urging Christians not "to selectively divest from certain companies whose products are used by Israel." They argue that a "one-sided approach" on divestment resolutions, even the selective divestment from companies profiting from the occupation proposed by the Methodists and Presbyterians, "damages the relationship between Jews and Christians that has been nurtured for decades."

While they are no doubt well-meaning, I believe that the rabbis and other opponents of divestment are sadly misguided. My voice will always be raised in support of Christian-Jewish ties and against the anti-Semitism that all sensible people fear and detest. But this cannot be an excuse for doing nothing and for standing aside as successive Israeli governments colonize the West Bank and advance racist laws.

I recall well the words of the Rev. Martin Luther King Jr. in his Letter from a Birmingham Jail in which he confesses to his "Christian and Jewish brothers" that he has been "gravely disappointed with the white moderate … who is more devoted to 'order' than to justice; who prefers a negative peace which is the absence of tension to a positive peace which is the presence of justice; who constantly says: 'I agree with you in the goal you seek, but I cannot agree with your methods of direct action;' who paternalistically believes he can set the timetable for another man's freedom. ..."

King's words describe almost precisely the shortcomings of the 1,200 rabbis who are not joining the brave Palestinians, Jews and internationals in isolated West Bank communities to protest nonviolently against Israel's theft of Palestinian land to build illegal, Jewish-only settlements and the separation wall. We cannot afford to stick our heads in the sand as relentless settlement activity forecloses on the possibility of the two-state solution.

If we do not achieve two states in the near future, then the day will certainly arrive when Palestinians move away from seeking a separate state of their own and insist on the right to vote for the government that controls their lives, the Israeli government, in a single, democratic state. Israel finds this option unacceptable and yet is seemingly doing everything in its power to see that it happens.

Many black South Africans have traveled to the occupied West Bank and have been appalled by Israeli roads built for Jewish settlers that West Bank Palestinians are denied access to, and by Jewish-only colonies built on Palestinian land in violation of international law.

Black South Africans and others around the world have seen the 2010 Human Rights Watch report which "describes the two-tier system of laws, rules, and services that Israel operates for the two populations in areas in the West Bank under its exclusive control, which provide preferential services, development, and benefits for Jewish settlers while imposing harsh conditions on Palestinians." This, in my book, is apartheid. It is untenable. And we are in desperate need of more rabbis joining the brave rabbis of Jewish Voice for Peace in speaking forthrightly about the corrupting decadeslong Israeli domination over Palestinians.

These are among the hardest words I have ever written. But they are vitally important. Not only is Israel harming Palestinians, but it is harming itself. The 1,200 rabbis may not like what I have to say, but it is long past time for them to remove the blinders from their eyes and grapple with the reality that Israel becoming an apartheid state or like South Africa in its denial of equal rights is not a future danger, as three former Israeli prime ministers — Ehud Barak, Ehud Olmert and David Ben Gurion — have warned, but a present-day reality. This harsh reality endured by millions of Palestinians requires people and organizations of conscience to divest from those companies — in this instance, from Caterpillar, Motorola Solutions and Hewlett Packard — profiting from the occupation and subjugation of Palestinians.

Such action made an enormous difference in apartheid South Africa. It can make an enormous difference in creating a future of justice and equality for Palestinians and Jews in the Holy Land.