Okay I am home now! This will be a fairly long post so bare with me lol.
First we have to break down and look at what is "left" and "right" in the USa (if were going to look at the Hindu American Foundation)
Left Wing
http://en.wikipedia.org/wiki/Left-wing_politics: "Left wingers" by and large support equity (not equality but equity
http://theequityline.org/wp-content/uploads/2014/03/equity.jpg) which basicly means support of those in need to life them up, are pro raising taxes, like social programs (EBT, universal healthcare, social security,etc tc etc) and increasing funding to these programs, but want to cut from other palces such as military, corporate "welfare"(subsidies). They are by and large "socially liberal" with support for ideas such as gay marriage, borders, female body rights (contraception and abortion). This group is mostly represented by Democrats but also se Socialists, Green party, and "left Libertarians")Libertarians are weird and will have their own paragraph)
Right Wing
Right-wing politics - Wikipedia, the free encyclopedia
"right wingers" believe in cutting taxes and cutting spending (not entirely true). they view laws restricting corporations as negative and want to continue to "conserve" the current social hierarchy. though they want to cut taxes and spending to social programs they want to increase spending for military and corporate subsidies. Socially they believe in keeping with tradition and avoid social change. this side is dominated by the republicans but can also see support from "right with libertarianism", and The tea party.
Libertarianism: Libertarians are weird and need their own paragraph. Liberaltarianism
Libertarianism - Wikipedia, the free encyclopedia by and large support, well liberty sometimes to an anarchistic state. They support ideas such as legalization of drugs, prostitution, along with many of the social ideas that right wingers support. Libertarians want to reduce or eliminate the power the government has allowing citizens to largely have control over their actions (within reason of course). Right Wing libertarians (such as Ron Paul) view the government's "meddling" with corporations to be a detriment to capital growth and fight against it. While Left Wing Libertarians (Noam Chomsky) view the government as corporate puppets and want to see the government no longer being funded or "controlled" by the rich. Then there are what's known as Anarchist Libertarians, they pretty much go with "everyone is responsible for their own actions, no government is the best government".
Libertarians: Left, Right or Neither? | Independent Political Report
From this we can see that both sides can and have had their issues with Hinduism and even HAF. From the Left you see groups like what Poeticus posted taking their liberalism to (in my opinion ) extreme sense, lambasting anyone that may not agree with everything they say. It has become increasingly popular to slam Religion (as a whole) with lefties (I get an plenty of argument explaining that just because Christians believe something doesn't mean ALL religions are like that) and thus many religious organisations are being pegged as " bad conservative groups" (despite the fact that HAF appears mostly liberal in the US). While from the right we get the "It's not Christian it's going to burn in hell" ideas. But even here the conservative churches can have some sway over their "left wing enemies" by providing false information (as Poeticuses chart shows), thus riling the left wingers into action.
The reason I call those groups "extreme" is they are not the majority of "left wingers" or liberals. Sure maybe most of the VOCAL assaults come from naive liberals but they only represent a small portion. While the "right wing" has been at this "destroy Hinduism" for THOUSANDS of years , they just recently started using their "opposition" as a weapon. There is one group I found directly attacking HAF (very often mind you) are The "CAG"
Hindu American Foundation fails to counter mounting evidence of links to violent Hindu Nationalist Movement - CAG,
http://hafsite.org/HAF_responds_to_allegations_by_radical_south_asians(whom HAF themself call radical). I find groups like this to be very extreme in their views. The main reason I find these groups to be extreme is "left wing" philosophy is based in the idea of being fair and equal to all. To attack an entire religions and the people belonging to it with little or no evidence in my eyes is extremism. These people take "Liberal" ideas and turn them into bigoted actions and that to me is extremism and not at all representative of the "left wing" or liberals at all.