Laurence Tribe, the Constitutional law prof at Harvard, has concerns about Bernie.

[Jarqui]

132. This

Bernie Sanders's Ratings and Endorsements on Issue: Civil Liberties and Civil Rights
(a lot more is there than I've listed below)
https://votesmart.org/candidate/evaluations/27110/bernie-sanders/13/civil-liberties-and-civil-rights
2018 National Association for the Advancement of Colored People (NAACP) - Positions 100%
2017 National Association for the Advancement of Colored People (NAACP) - "Civil Rights Federal Legislative Report Card" 100%
2011 National Association for the Advancement of Colored People (NAACP) - "Civil Rights Federal Legislative Report Card" 100%
2009-2010 National Association for the Advancement of Colored People (NAACP) - "Civil Rights Federal Legislative Report Card" 100%
2009 National Association for the Advancement of Colored People (NAACP) - Positions 95%
2007-2008 National Association for the Advancement of Colored People (NAACP) - Positions on Civil Rights and Social Justice Issues 100%
2007 National Association for the Advancement of Colored People (NAACP) - Positions 100%
2005-2006 National Association for the Advancement of Colored People (NAACP) - Positions 97%
2005 National Association for the Advancement of Colored People (NAACP) - Positions 96%
2003-2004 National Association for the Advancement of Colored People (NAACP) - Positions 90%
2001-2002 National Association for the Advancement of Colored People (NAACP) - Positions 94%
2001 National Association for the Advancement of Colored People (NAACP) - Positions 93%
2000 National Association for the Advancement of Colored People (NAACP) - Positions 100%
1999 National Association for the Advancement of Colored People (NAACP) - Positions 100%
1995-1996 National Association for the Advancement of Colored People (NAACP) - Positions 91%

In 1990, Vermont was 0.3% black. Today, Vermont is between 1 and 4% black.
So he hasn't supported the NAACP all those years to get a lot of votes in Vermont from blacks.
They represent a sincere carryover from his activism for Civil Rights and MLK in the 60s.

In the 1980s, Bernie backed Jesse Jackson's Rainbow Coalition
https://www.thenation.com/article/recalling-the-rainbow-roots-of-the-bernie-sanders-presidential-run/

In the early 1990's, he fought the crime bill that "disproportionately punished blacks"

Bernie Sanders on Civil Rights
http://www.ontheissues.org/Domestic/Bernie_Sanders_Civil_Rights.htm

What kind of response would happen if Flint MI were white?
Q [to Clinton]: On the Flint lead poisoning disaster, you have been critical of Gov. Rick Snyder, and how the state caused the lead poisoning problem, and has not acted fast enough to fix it. Would you as President order a federal response?
....
SANDERS: The Secretary described the situation appropriately. I did ask for the resignation of Governor Snyder because his irresponsibility was so outrageous. What we are talking about are children being poisoned. The idea that there has not been a dramatic response is beyond comprehension. When you have significant public health crisis, of course the federal government comes in. One wonders if this were a white suburban community what kind of response there would have been. Flint is a poor community. It is disproportionately African-American and minority. And what has happened there is absolutely unacceptable.

Source: MSNBC Democratic primary debate in New Hampshire , Feb 4, 2016

Q: Do black lives matter, or do all lives matter?
A: Black lives matter. The African American community knows that on any given day some innocent person like Sandra Bland can get into a car, and three days later she's dead in jail. We need to combat institutional racism from top to bottom, and we need major reforms in a broken criminal justice system. I intend to make sure people have education and jobs rather than jail cells.

Source: 2015 CNN Democratic primary debate in Las Vegas , Oct 13, 2015

Black Lives Matter: deal with institutional racism
Q: At Netroots Nation, you had a confrontation with a Black Lives Matter--
SANDERS: No, I didn't have a confrontation. I was there to speak about immigration reform. And some people thought of disrupting the meeting. And the issue that they raised was, in fact, a very important issue, about Black Lives Matter, in this case of Sandra Bland, about black people getting yanked out of an automobile, thrown to the ground, and ended up dead three days later because of a minor traffic violation.

Q: Well, I guess there were some people who felt that you were being too dismissive of the protesters.

SANDERS: Well, I'm not dismissive. I've been involved in the Civil Rights movement all of my life. And I believe that we have to deal with this issue of institutional racism. But we have to deal with the reality that 50% of young black kids are unemployed. That we have massive poverty in the America, in our country, and we an unsustainable level of income and wealth inequality.

Source: Meet the Press 2015 interviews of 2016 presidential hopefuls , Jul 26, 2015

Voter ID laws marginalize communities of color
[On issues relevant to Latino voters], in addition to immigration reform, we must also pursue policies that empower minority communities. This must start with energizing Latinos all across the country to engage in the democratic process and by thwarting efforts to disenfranchise minority voters. Restricting access through draconian voter ID laws and shortening early voting periods are thinly-veiled efforts to marginalize communities of color, low income people and seniors. These policies must be combatted at both the state and federal levels.
Source: The Essential Bernie Sanders, by Jonathan Tasini, p. 99 , Jun 29, 2015

Remove Confederate flag from State Houses
In the last 60 years this country has made significant progress on civil rights. But clearly, the events [regarding the Confederate flag] remind us how far we yet have to go in order to create a non-racist society.
I do not live in South Carolina. But I do believe that the time is long overdue for the people of South Carolina to remove the Confederate flag from the state house grounds in Columbia.

That flag is a relic of our nation's stained racial history. It should come down. Frankly, the Confederate flag does not belong on state house grounds. It belongs in a museum.

Source: The Essential Bernie Sanders, by Jonathan Tasini, p.105-6 , Jun 25, 2015

1964: civil rights activist in Congress on Racial Equality
I spent one year at Brooklyn College and 4 years at the University of Chicago, from which I graduated with a BA in 1964. I was not a good student. I learned a lot more from my out-of-class activities than I did through my formal studies. At the university I became a member of the Congress on Racial Equality (CORE), the Student Peace Union (SPU), and the Young People's Socialist League (YPSL). I participated in civil rights activities related to ending segregation in Chicago's school system and in housing, and I marched against the proliferation of nuclear weapons. I also worked, very briefly, for a trade union, the United Packinghouse Workers. At the end of my junior year I worked in a mental hospital in CA as part of a project for the American Friends Service Committee.
Source: Outsider in the House, by Bernie Sanders, p. 14 , Jun 17, 1997

Never accept racism, sexism, nor homophobia
It is vitally important to the future of this country and our state that we defeat the Republican agenda, and that we prevent the republicans from recapturing the Congress and taking the White House. That is enormously important. But it is even more important that we as progressives and as Vermonters hold on to that special vision that has propelled us forward for so many years.
A vision which says that we judge people not by their color, their gender, their sexual orientation, their nation of birth-- but by the quality of their character, and that we will never accept sexism, racism, or homophobia.

Source: Outsider in the House, by Bernie Sanders, p. 50 , Jun 17, 1997

Voted NO on ending preferential treatment by race in college admissions.
HR 6, the Higher Education Amendments Act of 1997, would prohibit any post-secondary institution that participates in any program under the Higher Education Act from discriminating or granting any preferential treatment in admission based on race, sex, ethnicity, color or national origin.
Reference: Amendment introduced by Riggs, R-CA.; Bill HR 6 ; vote number 1998-133 on May 6, 1998

Recognize June tenth as historical end of slavery.
Sanders co-sponsored recognizing Juneteenth as historical end of slavery
A resolution recognizing the historical significance of Juneteenth Independence Day and expressing that history should be regarded as a means for understanding the past and solving the challenges of the future.

Recognizes the historical significance to the nation, and supports the continued celebration, of Juneteenth Independence Day (June 19, 1865, the day Union soldiers arrived in Galveston, Texas, with news that the Civil War had ended and that the enslaved African Americans were free). Declares the sense of Congress that:

history should be regarded as a means for understanding the past and solving the challenges of the future; and
the celebration of the end of slavery is an important and enriching part of the history and heritage of the United States.
Legislative Outcome: House versions are H.CON.RES.155 and H.RES.1237; related Senate resolution S.RES.584 counts for sponsorship. Resolution agreed to in Senate, by Unanimous Consent.
Source: S.RES.584 08-SR584 on Jun 4, 2008

Bernie Sanders on Black Rights
https://feelthebern.org/bernie-sanders-on-black-rights/

No, Bernie Sanders didn't toss eggs at civil rights protesters. He was one of the protesters
https://www.politifact.com/facebook-fact-checks/statements/2019/feb/25/facebook-posts/facebook-post-has-false-information-about-bernie-s/
https://www.factcheck.org/2019/03/social-posts-spin-sanders-photo/

John Lewis kneecapped Sanders civil rights efforts and threw in with Hillary. Other black leaders and blacks in general followed him or were already behind the Clintons. A number were outraged and hammered Lewis for it.

"Civil rights icon John Lewis walked back his comments dismissing Vermont Sen. Bernie Sanders' work on racial equality, saying he didn't intend to disparage the presidential candidate by saying of his time in the 1960s"
https://www.ajc.com/blog/politics/john-lewis-did-not-intend-disparage-bernie-sanders/yZUUIHg90CgkCJ4VrAetZO/

"He didn't see Bernie Sanders because Bernie Sanders was doing fair and open housing in Chicago - that's why he didn't see him. No matter how good your eyesight is, if you are standing in Alabama, you can't see people in Chicago," Ellison told CNN. "That doesn't mean he wasn't absolutely there, fighting for justice, fighting for open housing."

Harry Belafonte weighed in

Bernie summarizes his Civil Rights efforts briefly
https://www.facebook.com/watch/?v=10154055038692908

Where I really got to the bottom of it was reading the transcripts of his speeches to Congress. He lays it all out for all to see - time after time - tirelessly hammering away at these issues. You can watch a bunch of them here:
https://www.c-span.org/person/?berniesanders
It's easier than digging through the congressional record like I did but may not be as complete.

This smacked together post doesn't do his efforts justice. But Sanders is not just talking the talk. If you look at his history, you find him fighting for these things all his life - not just in the 60s & 70s.